Details for Harvest Job Id: f9596031-4f38-46e1-8f83-83fe589aa424
Job Info
| Harvest Source: | alaska-division-of-geological-and-geophysical-surveys |
| status: | complete |
| job_type: | harvest |
| date_created: | 2026-01-17 20:05:58.114286 |
| date_finished: | 2026-01-17 20:15:56.902709 |
| records_total: | 1017 |
| records_added: | 0 |
| records_updated: | 0 |
| records_deleted: | 0 |
| records_errored: | 1017 |
| records_unchanged: | 0 |
| records_validated: | 0 |
| id: | f9596031-4f38-46e1-8f83-83fe589aa424 |
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No job errors foundRecord Error Details
| Error type | Number of errors |
| ExternalRecordToClass | 29 |
| TransformationException | 988 |
fd2053e7-3edc-41df-b333-7b5028091add
Identifier: N/A
Title: N/A
Harvest Record ID: N/A
Error Message: alaska-division-of-geological-and-geophysical-surveys https://dggs.alaska.gov/webpubs/metadata/GPR2011-2.xml failed to prepare record for harvest :: UnicodeDecodeError('utf-8', b'<?xml version="1.0" encoding="ISO-8859-1"?>\r\n<metadata>\r\n<idinfo>\r\n<citation>\r\n<citeinfo>\r\n<origin>Burns, L.E.</origin>\r\n<origin>Fugro Airborne Surveys Corp.</origin>\r\n<origin>Fugro GeoServices, Inc.</origin>\r\n<pubdate>2011</pubdate>\r\n<title>IDITAROD SURVEY AREA: Magnetic and Electromagnetic Line, Grid, and Vector Data and Maps, Innoko, Iditarod, and Ophir mining districts, Iditarod and Ophir quadrangles, western Alaska (DIGHEM [V] SURVEY)</title>\r\n<geoform>raster digital data, tabular digital data, and vector digital data</geoform>\r\n<serinfo>\r\n<sername>Geophysical Report</sername>\r\n<issue>GPR 2011-2</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>Fairbanks, AK, USA</pubplace>\r\n<publish>State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS)</publish>\r\n</pubinfo>\r\n<othercit>1 DVD</othercit>\r\n<onlink>http://dx.doi.org/10.14509/22842</onlink>\r\n<onlink>http://dggs.alaska.gov/pubs/gpdata/155</onlink>\r\n</citeinfo>\r\n</citation>\r\n<descript>\r\n<abstract>This digital publication, GPR 2011-2, contains data produced from airborne geophysical surveys conducted in 2010 for the Iditarod survey area in the Innoko, Iditarod, and Ophir mining districts, Iditarod and Ophir quadrangles, western Alaska. Aeromagnetic and electromagnetic (EM) data were acquired by helicopter for about 852 sq miles. Fugro Airborne Survey\'s frequency-domain DIGHEM V system was used for the EM data. GPR 2011-2 includes (1) raw and processed linedata; (2) gridded, Google Earth, and Geotiff formats of the calculated linedata; (3) maps of the data; and (4) vector files of data contours and flight lines.</abstract>\r\n<purpose>The survey was part of the Alaska Airborne Geophysical/Geological Mineral Inventory project funded by the Alaska State Legislature and managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). The project seeks to catalyze private-sector mineral development investment. The project delineates mineral zones on Alaska state lands that: 1) have major economic value; 2) can be developed in the short term to provide high quality jobs for Alaska; and 3) will provide economic diversification to help offset the loss of Prudhoe Bay oil revenue.</purpose>\r\n<supplinf>\r\nThe airborne data were acquired and processed under contract between the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS), and Fugro GeoServices, Inc. Fugro Airborne Surveys, the subcontractor, acquired and processed the data in 2010 and 2011. A future publication will include the technical project report, interpretation map, and EM anomalies, as well as other files.\r\n\r\nFile \'gpr2011-002_readme.PDF\' contains file names and definitions, map numbers and grid correlations, projection information, location figures, and much general information. In case the text version of \'gpr2011-002_readme.txt\' needs to be used, the location figures are provided as jpegs in the main directory. Some detailed information about the data is given in the \'Entity_and_Attribute_Information\' section of this metadata file. \'Iditarod_linedata.txt\' gives information on the linedata in an easy-to-read format. All data are provided in NAD27, UTM zone 4N, except for Google Earth KMZ files, which are in Geographic Coordinate System (Simple Cylindrical projection) with a WGS84 datum. Besides NAD27, UTM zone 4N easting and northing coordinates, the linedata files also include latitude and longitude (Geographic Coordinate System with a WGS84 datum).\r\n\r\nThis publication, GPR2011-2, contains the data types or files given below\r\n\r\n>***********************************************************\r\nLINEDATA Geosoft binary GDB and Geosoft ASCII XYZ format\r\n\r\n>***********************************************************\r\nGRIDS, GEOTIFFS, GOOGLE EARTH FILES, VECTORS\r\n\r\nFile names and general definitions for the raster and vector files are given below. Not all files listed below are included in each format listed above. Grid files are provided in Geosoft binary GRD and ER Mapper ERS formats. Vector files are provided in an ESRI shape file format.\r\n\r\nAll file names listed below start with \'Idi_\'.\r\n\r\n> NAME GENERAL DEFINITION\r\n>\r\n> mag_diu Pre-final total magnetic field (without leveling\r\n> and before IGRF removal)\r\n> mag_rmi Residual magnetic field with IGRF removed (nT)\r\n> magigrf Total magnetic field with IGRF removed (nT)\r\n> 1vd First vertical derivative (calculated vertical gradient)\r\n> of the total magnetic field with IGRF removed (nT/m)\r\n> asig Analytic signal calculated from the total magnetic\r\n> field with IGRF removed (nT/m)\r\n> tiltder Tilt derivative of total magnetic field with\r\n> IGRF removed (degrees)\r\n> res56k Apparent coplanar resistivity for 56,000 Hz (56 kHz; ohm-m)\r\n> res7200 Apparent coplanar resistivity for 7200 Hz (ohm-m)\r\n> res900 Apparent coplanar resistivity for 900 Hz (ohm-m)\r\n> dtm Digital terrain or elevation model (m)\r\n> SecGrid Alaska PLSS Section Grid for map sheets (vector only)\r\n> UTMGrid NAD27, UTM zone 4N grid (vector only)\r\n> fp Flight path (vector only)\r\n>\r\n>**********************************************************\r\nMAPS PDF and HPGL/2 formats\r\n\r\nThe thirteen maps at 1:63,360-scale need three sheets to cover the survey area. Maps are generally produced in two versions, one with data contours and no topography and one with topography and no data contours. Not all images are provided as maps. File \'gpr2011-002_readme.PDF\' contains a table linking the map numbers with the data and map version. This information is also in the \'Detailed_Description\' section for the maps.\r\n</supplinf>\r\n</descript>\r\n<timeperd>\r\n<timeinfo>\r\n<rngdates>\r\n<begdate>201008</begdate>\r\n<enddate>201110</enddate>\r\n</rngdates>\r\n</timeinfo>\r\n<current>publication date</current>\r\n</timeperd>\r\n<status>\r\n<progress>Complete</progress>\r\n<update>None</update>\r\n</status>\r\n<spdom>\r\n<bounding>\r\n<westbc>-157.99</westbc>\r\n<eastbc>-156.26</eastbc>\r\n<northbc>63.17</northbc>\r\n<southbc>62.44</southbc>\r\n</bounding>\r\n</spdom>\r\n<keywords>\r\n<theme>\r\n<themekt>ISO 19115 Topic Category</themekt>\r\n<themekey>geoscientificInformation</themekey>\r\n</theme>\r\n<theme>\r\n<themekt>none</themekt>\r\n<themekey>Aeromagnetic Data</themekey>\r\n<themekey>Aeromagnetic Map</themekey>\r\n<themekey>Airborne Geophysical Survey</themekey>\r\n<themekey>Apparent Resistivity Data</themekey>\r\n<themekey>Apparent Resistivity Map</themekey>\r\n<themekey>Digital Elevation Model</themekey>\r\n<themekey>DIGHEM V EM System</themekey>\r\n<themekey>Electromagnetic Data</themekey>\r\n<themekey>First Vertical Derivative</themekey>\r\n<themekey>Geophysics</themekey>\r\n<themekey>HEM Survey</themekey>\r\n</theme>\r\n<place>\r\n<placekt>none</placekt>\r\n<placekey>Alaska, State of</placekey>\r\n<placekey>Iditarod Mining District</placekey>\r\n<placekey>Iditarod Quadrangle</placekey>\r\n<placekey>Innoko Mining District</placekey>\r\n<placekey>McGrath Mining District</placekey>\r\n<placekey>Ophir Quadrangle</placekey>\r\n</place>\r\n</keywords>\r\n<accconst>This report, map and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).</accconst>\r\n<useconst>Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS).</useconst>\r\n<ptcontac>\r\n<cntinfo>\r\n<cntorgp>\r\n<cntorg>Alaska Division of Geological & Geophysical Surveys</cntorg>\r\n</cntorgp>\r\n<cntpos>Geophysicist</cntpos>\r\n<cntaddr>\r\n<addrtype>mailing address</addrtype>\r\n<address>3354 College Rd</address>\r\n<city>Fairbanks</city>\r\n<state>AK</state>\r\n<postal>99709-3707</postal>\r\n<country>USA</country>\r\n</cntaddr>\r\n<cntvoice>(907) 451-5020</cntvoice>\r\n</cntinfo>\r\n</ptcontac>\r\n<datacred>Funding was provided by the Alaska State Legislature as part of the DGGS Airborne Geophysical/Geological Mineral Inventory (AGGMI) program.</datacred>\r\n<native>Microsoft Windows XP Professional Version 2002 Service Pack 2; Geosoft Oasis Montaj Version 7.0; Autocad Version 2000; ESRI Shape file format; MapInfo Professional file format; ER Mapper; Adobe Acrobat Distiller v9.0; Adobe Acrobat Professional v9.0; Fugro Airborne Survey proprietary software</native>\r\n<crossref>\r\n<citeinfo>\r\n<origin>Burns, L.E.</origin>\r\n<origin>Stevens Exploration Management Corp.</origin>\r\n<origin>Fugro Airborne Surveys Corp.</origin>\r\n<pubdate>2000</pubdate>\r\n<title>DVD containing profile data, gridded data, vector data, and location information of 2000 geophysical survey data for parts of the Aniak and Iditarod mining districts, southwestern Alaska</title>\r\n<geoform>raster digital data, tabular digital data, vector digital data</geoform>\r\n<serinfo>\r\n<sername>Geophysical Report</sername>\r\n<issue>GPR 2000-38</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>Fairbanks, AK, USA</pubplace>\r\n<publish>State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS)</publish>\r\n</pubinfo>\r\n<othercit>2 DVDs</othercit>\r\n<onlink>http://dx.doi.org/10.14509/2721</onlink>\r\n<onlink>http://dggs.alaska.gov/pubs/gpdata/60</onlink>\r\n</citeinfo>\r\n</crossref>\r\n<crossref>\r\n<citeinfo>\r\n<origin>L.E. Burns</origin>\r\n<origin>U.S. Bureau of Land Management</origin>\r\n<origin>Fugro Airborne Surveys</origin>\r\n<origin>Stevens Exploration Management Corp.</origin>\r\n<pubdate>2003</pubdate>\r\n<title>Line, grid, and vector data of the airborne geophysical survey data of the Sleetmute area, southwestern Alaska</title>\r\n<geoform>raster digital data, tabular digital data, vector digital data</geoform>\r\n<serinfo>\r\n<sername>Geophysical Report</sername>\r\n<issue>GPR 2003-10</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>Fairbanks, AK, USA</pubplace>\r\n<publish>State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS)</publish>\r\n</pubinfo>\r\n<othercit>1 DVD</othercit>\r\n<onlink>http://dx.doi.org/10.14509/2994</onlink>\r\n<onlink>http://dggs.alaska.gov/pubs/gpdata/28</onlink>\r\n</citeinfo>\r\n</crossref>\r\n</idinfo>\r\n<dataqual>\r\n<attracc>\r\n<attraccr>Survey contracts specified the conditions and specifications under which these data were collected. Altimeter, heading, lag, and frequent EM calibrations were done. More information will be available in the project report to be published in the future.</attraccr>\r\n</attracc>\r\n<logic>Data for this survey were collected by a single subcontractor (Fugro Airborne Surveys) who was responsible for collecting and processing the data. All the data were collected with the same instruments (magnetometers, electromagnetic bird and sensors, gamma ray spectrometer, altimeters, and navigational system).</logic>\r\n<complete>\r\nThe file \'IDITAROD.GDB\' contains 1,954,413 records with 50 channels each. Channel names and definitions of all 50 channels are included in \'Iditarod_linedata.txt\' and the \'Entity_and_Attribute_Information\' section of this metadata.\r\n\r\nFifty-three channels were sampled or are based on sampling at 0.1 sec. intervals. Six of the seven channels listed immediately below were sampled at intervals larger than 0.1 sec. and contain interpolated data. The seventh is based on one of the interpolated channels. The first five values in the table below were measured at 0.5 seconds, but the base station was measured at 1.0 seconds, and thus the post-processed value is also good to 1.0 second.\r\n\r\nCHANNELS CONTAINING INTERPOLATED VALUES\r\n>***************************************\r\n> X_NAD27z4N (location information; interpolated to 0.1 second from 1.0 second post-processed value)\r\n> Y_NAD27z4N (location information; interpolated to 0.1 second from 1.0 second post-processed value))\r\n> GPSZ (height above geoid information; interpolated to 0.1 second from 1.0 second post-processed value)\r\n> lat_WGS84 (location information; interpolated to 0.1 second from 1.0 second post-processed value)\r\n> lon_WGS84 (location information; interpolated to 0.1 second from 1.0 second post-processed value)\r\n> diurnal_filt (diurnal filter; interpolated to 0.1 second from 1.0 second-sampled \'diurnal_filt\')\r\n> diurnal_cor (the correction applied based on the interpolated \'diurnal_filt\' channel)\r\n\r\nFew values are missing from the databases.\r\nCHANNELS WITH MISSING VALUES IN \'IDITAROD.GDB\'\r\nChannel Data Null\r\nValues Values\r\n>*****************************************\r\n> cpsp 1,954,399 14\r\n> cxsp 1,954,394 19\r\n> cppl 1,954,372 41\r\n> diurnal_filt 1,954,339 74\r\n> mag_raw 1,952,640 1,773\r\n> mag_lag 1,952,497 1,916\r\n> mag_diu 1,952,497 1,916\r\n> mag_rmi 1,952,497 1,916\r\n> magigrf 1,952,497 1,916\r\n> res56K 1,943,388 11,025\r\n> res7200 1,943,388 11,025\r\n> res900 1,943,388 11,025\r\n> dep56k 1,852,537 101,876\r\n> dep7200 1,832,294 122,119\r\n> dep900 1,743,697 210,716\r\n\r\nMissing magnetic values occur in the Iditarod database for the typical reasons of the lagging process, at the beginning of some lines, and due to despiking. The Iditarod data has a number of magnetic dropouts. When the missing interval is too wide to comfortably interpolate, the area is left as dummies in the database. When the profile gaps are extensive enough, the gridding does not spline across them. Two gaps are present in the Iditarod magnetic grids. Missing values in the apparent resistivity (res56k, res7200, and res900) and associated calculated \'depth\' (dep56k, dep7200, and dep900) are due to calculations being meaningless, generally caused by increase in altitude.\r\n</complete>\r\n<posacc>\r\n<horizpa>\r\n<horizpar>The helicopter position was derived every 0.5 seconds using post-flight differential positioning to an accuracy of better than 1 m.</horizpar>\r\n</horizpa>\r\n<vertacc>\r\n<vertaccr>The laser altimeter (\'ALTLAS_BIRD\'), located in the bird (EM equipment and magnetometer housing), had a stated resolution of 0.10 meter. The ALTLAS_BIRD value may be unreliable over bodies of water where the laser returns are scattered.</vertaccr>\r\n</vertacc>\r\n</posacc>\r\n<lineage>\r\n<srcinfo>\r\n<srccite>\r\n<citeinfo>\r\n<origin>Akima, H.</origin>\r\n<pubdate>1970</pubdate>\r\n<title>A new method of interpolation and smooth curve fitting based on local procedures</title>\r\n<serinfo>\r\n<sername>Journal of the Association of Computing Machinery</sername>\r\n<issue>v. 7, no. 4</issue>\r\n</serinfo>\r\n<onlink>None</onlink>\r\n</citeinfo>\r\n</srccite>\r\n<typesrc>paper</typesrc>\r\n<srctime>\r\n<timeinfo>\r\n<sngdate>\r\n<caldate>1970</caldate>\r\n</sngdate>\r\n</timeinfo>\r\n<srccurr>1970</srccurr>\r\n</srctime>\r\n<srccitea>Akima, 1970</srccitea>\r\n<srccontr>Fugro Airborne Surveys used a modification of this method while making grids.</srccontr>\r\n</srcinfo>\r\n<srcinfo>\r\n<srccite>\r\n<citeinfo>\r\n<origin>Alaska Department of Natural Resources - Land Records Information Section</origin>\r\n<pubdate>1995</pubdate>\r\n<title>Alaska PLSS Section Grid</title>\r\n<geoform>vector digital data</geoform>\r\n<pubinfo>\r\n<pubplace>http://mapper.landrecords.info/ (Anchorage, Alaska)</pubplace>\r\n<publish>State of Alaska, Department of Natural Resources, Division, Land Records Information Section (LRIS)</publish>\r\n</pubinfo>\r\n<othercit>ESRI shape file format</othercit>\r\n<onlink><ftp://ftp.dnr.state.ak.us/asgdc/adnr/pls_section.zip></onlink>\r\n<onlink>http://dnr.alaska.gov/SpatialUtility/SUC?cmd=vmd&layerid=45 (metadata)</onlink>\r\n</citeinfo>\r\n</srccite>\r\n<typesrc>online</typesrc>\r\n<srctime>\r\n<timeinfo>\r\n<rngdates>\r\n<begdate>1950</begdate>\r\n<enddate>1998</enddate>\r\n</rngdates>\r\n</timeinfo>\r\n<srccurr>2008</srccurr>\r\n</srctime>\r\n<srccitea>ADNR-LRIS, 1995</srccitea>\r\n<srccontr>The downloaded section grid file, built from original protraction diagram data, was used as a starting point for the section grid digital file included in GPR 2011-2. Minor formatting modifications were made to the file. The section grid is used on the maps without topography and is provided in digital format in this publication. The publication date given above reflects the current metadata file for the Alaska PLSS Section Grid.</srccontr>\r\n</srcinfo>\r\n<procstep>\r\n<procdesc>\r\nThe airborne geophysical data were acquired with a DIGHEM (V) Electromagnetic (EM) system and a Fugro D1344 cesium magnetometer with a Scintrex CS3 cesium sensor between August 5 to August 24, 2010. The EM and magnetic sensors were flown at a height of 100 feet. In addition, the survey recorded data from radar and laser altimeters, GPS navigation system, 50/60 Hz monitors, and video camera.\r\n>\r\nFlights were performed with an Aerospatiale AS-350-B3 helicopter at a mean terrain clearance of 200 feet (61 m) along N20W (340 degrees) survey flight lines with one-quarter mile (402.3 m) line spacing. Tie lines were flown perpendicular to the flight lines at intervals of approximately 3 miles (4,828 m). Traverse line coverage was 3,003.8 mi (4,834.2 km) and tie line coverage 395.8 mi (637.0 km) for a total of 3,399.6 km (5,471.2 km) of data. This distance includes overlapping reflight segments but not any rejected portions of lines.\r\n>\r\nA Novatel OEM4-G2L Global Positioning System was used for navigation and flight path recovery. The helicopter position was derived every 0.5 seconds (2 Hz); the ground GPS base station data were collected at 0.1 second (10 Hz) intervals. The use of the differentially-corrected base station data results in a positional accuracy of better than five meters. The positional xy data are interpolated from 2 Hz to 10 Hz. Flight path positions were projected onto the Clarke 1866 (UTM zone 4N) spheroid, 1927 North American datum using a central meridian (CM) of 159 degrees, a north constant of 0, and an east constant of 500,000.\r\n</procdesc>\r\n<procdate>2010</procdate>\r\n</procstep>\r\n<procstep>\r\n<procdesc>The total magnetic field data were acquired with a sampling interval of 0.1 seconds, and were (1) corrected for measured system lag (resulting in channel \'mag_lag\' in file \'Iditarod.gdb\'), (2) corrected for diurnal variations by subtraction of the digitally recorded base station magnetic data (resulting in channel \'mag_diu\' in file \'Iditarod.gdb\'), (3) adjusted for regional variations (by subtracting IGRF model 2010, updated for date of flight and elevation variations), (4) leveled to the tie line data resulting in the final residual magnetic intensity (resulting in channel \'mag_rmi\' in file \'Iditarod.gdb\'), and (5) increased by a constant IGRF average value to restore the mag_rmi values to a total magnetic field channel (resulting in channel \'magigrf\' in \'Iditarod.gdb\'). \'Mag_Diu\', \'Mag_RMI\', and \'MagIGRF\' were then interpolated onto a regular 80-m grid using a modified Akima (1970) technique.</procdesc>\r\n<srcused>Akima, 1970</srcused>\r\n<procdate>2010</procdate>\r\n</procstep>\r\n<procstep>\r\n<procdesc>\r\nThree different algorithms were applied to the total magnetic field 80 m grid, resulting in three magnetic derivative grids. The analytic signal grid (Idi_ASig) is the total amplitude of all directions of magnetic gradient calculated from the sum of the squares of the three orthogonal gradients. Mapped highs in the calculated analytic signal of the magnetic parameter locate the anomalous source body edges and corners (e.g., contacts, fault/shear zones, basement fault block boundaries or lithologic contacts, etc.). Analytic signal maxima are located directly over faults and contacts, regardless of structural dip, and independently of the direction of the induced and/or remanent body magnetizations.\r\n>\r\nThe calculated magnetic tilt grid (Idi_TiltDer) is the angle between the horizontal gradient and the total vertical gradient, and is useful for identifying the depth and type of magnetic source. The tilt angle is positive over the source, crosses through zero at, or near, the edge of a vertical sided source, and is negative outside the source zone. It has the added advantage of responding equally well to shallow and deep sources and is able to resolve deeper sources that may be masked by larger responses caused by shallower sources.\r\n>\r\nThe first vertical derivative grid was calculated using a fast Fourier transform (FFT) based frequency-domain filtering algorithm. The vertical gradient algorithm enhances the response of magnetic bodies in the upper 500 m and attenuates the response of deeper bodies. The resulting (calculated) vertical gradient grid (\'Idi_1VD\') provides better definition and resolution of near-surface magnetic units and helps to identify weak magnetic features that may not be evident in the total field data.\r\n>\r\nAll magnetic and derivative derivative magnetic grids were then resampled from the 80-m cell size down to a 25-m cell size using a modified Akima (1970) technique to produce the maps and final grids contained in this publication.\r\n</procdesc>\r\n<srcused>Akima, 1970</srcused>\r\n<procdate>2010</procdate>\r\n</procstep>\r\n<procstep>\r\n<procdesc>The DIGHEM (V) EM system measured inphase and quadrature components at five frequencies. Two vertical coaxial-coil pairs operated at 1113 (1000) and 5491 (5500) Hz while three horizontal coplanar-coil pairs operated at 923 (900), 7090 (7200), and 55,590 (56,000) Hz. EM data were sampled at 0.1 second intervals. The EM system responds to bedrock conductors, conductive overburden, and cultural sources. The EM inphase and quadrature data were drift corrected using base level data collected at high altitude (areas of no signal). Along-line filters are applied to the data to remove spheric spikes. The data were inspected for variations in phase, and a phase correction was applied to the data if necessary. Apparent resistivities were then calculated from the inphase and quadrature data for all coplanar frequencies based on a pseudo-layer half-space model. Manual leveling of the inphase and quadrature of each coil pair, based on the resistivity data and comparisons to the data from the other frequencies, was performed. Automated micro-leveling is carried out in areas of low signal. The EM data were interpolated onto a regular 80-m grid using a modified Akima (1970) technique. The resulting grids were subjected to a 3x3 Hanning filter and resampled to a 25-m cell size before contouring and map production.</procdesc>\r\n<srcused>Akima, 1970</srcused>\r\n<procdate>2010</procdate>\r\n</procstep>\r\n<procstep>\r\n<procdesc>The digital elevation/terrain model was produced from the differentially corrected GPS-Z data (channel \'GPSZ\' in file \'Iditarod.gdb\') and the laser altimeter data measured in the bird (channel \'ALTLAS_BIRD\' in file \'Iditarod.gdb\'). Both the GPSZ and ALTLAS_BIRD data were checked for spikes, which were removed manually. The ALTLAS_BIRD data were despiked and then filtered using a 13 median filter, followed by a 13 Hanning filter. The corrected altimeter was then subtracted from the GPSZ data to produce profiles of the height above mean sea level along the survey lines. The data were manually leveled to remove any errors between lines. After all leveling, the data were DC shifted to match the local maps, in this case, NAD27. The 80-m DTM grid was then resampled to a 25-m cell size to produce the DTM grid contained in this publication.</procdesc>\r\n<procdate>2010</procdate>\r\n</procstep>\r\n<procstep>\r\n<procdesc>DGGS downloaded the Alaska PLSS Section Grid shapefile in fall 2010 and cut the file to roughly fit the map sheets for this publication using MapInfo Professional. Fugro Airborne Surveys modified the formatting of the file using AutoCad, changing township and range line widths and colors, and added township and range labels. The modified file was then used as overlays on maps without topography.</procdesc>\r\n<srcused>ADNR-LRIS, 1995</srcused>\r\n<procdate>2010</procdate>\r\n</procstep>\r\n<procstep>\r\n<procdesc>The HPGL/2 files were created with HP Designjet 5000 printer driver v5.32 and plot on some plotters, but not all plotters correctly. The Adobe Acrobat format files were created with Adobe Acrobat Distiller v9.0 from Postscript files.</procdesc>\r\n<procdate>2011</procdate>\r\n</procstep>\r\n</lineage>\r\n</dataqual>\r\n<spref>\r\n<horizsys>\r\n<planar>\r\n<gridsys>\r\n<gridsysn>Universal Transverse Mercator</gridsysn>\r\n<utm>\r\n<utmzone>4</utmzone>\r\n<transmer>\r\n<sfctrmer>0.9996</sfctrmer>\r\n<longcm>-159</longcm>\r\n<latprjo>0</latprjo>\r\n<feast>500000</feast>\r\n<fnorth>0</fnorth>\r\n</transmer>\r\n</utm>\r\n</gridsys>\r\n<planci>\r\n<plance>row and column</plance>\r\n<coordrep>\r\n<absres>25</absres>\r\n<ordres>25</ordres>\r\n</coordrep>\r\n<plandu>meters</plandu>\r\n<pclname>Grids</pclname>\r\n</planci>\r\n</planar>\r\n<geodetic>\r\n<horizdn>North American Datum of 1927</horizdn>\r\n<ellips>Clarke 1866</ellips>\r\n<semiaxis>6378206.4</semiaxis>\r\n<denflat>294.978698</denflat>\r\n</geodetic>\r\n</horizsys>\r\n</spref>\r\n<eainfo>\r\n<overview>\r\n<eaover>\r\nThe linedata file (\'Iditarod\') is provided in both Geosoft binary GDB and Geosoft ASCII XYZ formats. A file (\'Iditarod_linedata.txt\') contains some of the linedata information included in this metadata document, but in normal ASCII text format. Iditarod_linedata.txt is also included with each downloadable zipped database file.\r\n\r\nEach linedata file contains raw and processed linedata, and related calculated fields. Missing data are represented with the dummy variable \'*\'. Each of the 340 flight lines or partial flight lines (e.g., Line 20210, referred to as \'LINE\' attribute) is associated with a \'DATE\' (e.g., 2010/09/10), a \'FLIGHT (number)\' (e.g., 19056), and a particular multi-record set of data. Each record represents data acquisition from one spatial location in the flight line. A total of 1,952,413 records are present in each data file.\r\n</eaover>\r\n<eadetcit>L.E. Burns, Division of Geological & Geophysical Surveys and Fugro Airborne Surveys</eadetcit>\r\n</overview>\r\n<detailed>\r\n<enttyp>\r\n<ealname>LINEDATA</ealname>\r\n<enttypl>Iditarod.GDB and Iditarod.XYZ</enttypl>\r\n<enttypd>The file \'Iditarod\' contains raw and processed linedata and related calculated fields for locational, magnetic, and electromagnetic data. The file is provided in Geosoft binary grid (GRD) and Geosoft ASCII XYZ (XYZ) formats; formatting varies slightly between these. Except for the \'LINE\' attribute, all attributes, including \'DATE\' and \'FLIGHT\', are represented by one of the 50 data columns on each record. The \'LINE\' and \'FLIGHT\' attributes are discussed further in the attribute \'ID Cell\'.</enttypd>\r\n<enttypds>L.E. Burns & Fugro Airborne Surveys</enttypds>\r\n</enttyp>\r\n<attr>\r\n<attrlabl>ID_CELL</attrlabl>\r\n<attrdef>\r\nThe \'ID CELL\' occurs in the GDB file only; the contents of the \'ID CELL\' are also present in the XYZ file. In the \'ID CELL\' for this project, the \'LINE\' attribute is followed by a colon followed by the \'FLIGHT\' attribute (e.g., \'L20010:19053\' and \'T29030:19064\'). More than one line is typically flown on a particular date and flight; more than one flight may be flown on a particular date. Each ID-cell value will have an associated spreadsheet view consisting of a column for each of the 50 attributes. In the XYZ file, the \'LINE\' and \'FLIGHT\' attributes and the \'DATE\' are present as header lines, one attribute per line, before each set of associated data, for example:\r\n\r\n> //Flight 19066\r\n> //Date 2010/09/12\r\n> Line 29220 (or \'Tie 29220\', etc.)\r\n> Followed by all records for points sampled along Line 29220.\r\n> (Pattern is repeated for each line number).\r\n\r\nThe \'ID CELL\' content, particularly combined with the definitions below for this particular survey, provides information about the flight line layout.\r\n</attrdef>\r\n<attrdefs>L.E. Burns & Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>\r\nDefinitions of the \'LINE\' and \'FLIGHT\' attributes are listed below.\r\n\r\n> LINE TYPES and SYMBOLS:\r\n> Traverse lines - oriented nominally N20W (340 degrees);\r\n> Tie lines - oriented nominally N70E (70 degrees); and\r\n> Border lines - present inside and parallel to the survey\r\n> tract border where traverse or tie lines\r\n> are not parallel to the border.\r\n> Traverse lines - \'L\' (GDB file); \'LINE\' (XYZ file).\r\n> Tie and border lines - \'T\' (GDB file); \'TIE\' (XYZ file).\r\n\r\n> LINE NUMBERS\r\n> Planned flight lines increase by 10 in a consistent fashion.\r\n> For this project, traverse line numbers increase from SW to\r\n> NE; tie line numbers increase from north to south; and\r\n> border line numbers increase in a clockwise direction.\r\n>\r\n> When more than one uninterrupted flight traverse was needed\r\n> to complete a planned flight line, the fifth digit of the line\r\n> number is increased by \'1\' for each new flight segment/version.\r\n\r\n> MAIN LINE NUMBERS:\r\n> Lowest Traverse Lines: L20010 (southwest)\r\n> Highest Traverse Lines: L22770 (northeast)\r\n> Lowest Tie Lines: T29010 (north)\r\n> Highest Tie Lines: T29110 (south)\r\n> Lowest Border Lines: T19120 (increasing in clockwise direction from the southwestern corner)\r\n> Highest Border Lines: T29333 (south)\r\n\r\n>------------------------------------------------------------\r\n> \'FLIGHT\' DESIGNATORS\r\n> The 5 digit flight designator consists of a two digit Fugro\r\n> Dighem (V) system number (19 for this project) and a three\r\n> digit flight identification number, e.g., \'066\'.\r\n</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>x_NAD27z4N</attrlabl>\r\n<attrdef>bird position - easting NAD27 (UTM Zone 4N)</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>550652.89</rdommin>\r\n<rdommax>640886.12</rdommax>\r\n<attrunit>m</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>y_NAD27z4N</attrlabl>\r\n<attrdef>bird position - northing NAD27 (UTM Zone 4N)</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>6925776.17</rdommin>\r\n<rdommax>7004543.64</rdommax>\r\n<attrunit>m</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>fid</attrlabl>\r\n<attrdef>Fiducial increment; the time in tenths of seconds from the start to the end of the particular flight. Sampling typically occurred at each fiducial for almost all items in the database.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>The attribute measurement resolution is 0.1 second. The values increase from the beginning of a flight to the end. Only FIDs during production flights are included in the database.</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>lat_WGS84</attrlabl>\r\n<attrdef>bird position - latitude WGS84</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>62.4603987</rdommin>\r\n<rdommax>63.1500890</rdommax>\r\n<attrunit>degrees</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>lon_WGS84</attrlabl>\r\n<attrdef>bird position - longitude WGS84</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-158.0191346</rdommin>\r\n<rdommax>-156.2164147</rdommax>\r\n<attrunit>degrees</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>flight</attrlabl>\r\n<attrdef>First two digits are Fugro\'s EM bird identification number for the bird used for this job, i.e., \'19\'. The last three digits represent the flight numbers associated with this project. A flight number is the number of the helicopter flight from home base to home base associated with this project. The flights are numbered from the beginning of the project to the end. Only those flight numbers containing acquisition of final data measurements are included in the database.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>19034</rdommin>\r\n<rdommax>19084</rdommax>\r\n<attrunit>flight</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>date</attrlabl>\r\n<attrdef>dates (yyyy/mm/dd) of production flights</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>2010/08/25</rdommin>\r\n<rdommax>2010/09/16</rdommax>\r\n<attrunit>day</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>altrad_calcbird</attrlabl>\r\n<attrdef>calculated bird height above surface to simulate location of radar altimeter in the bird; radar altimeter measurement was recorded in the helicopter. Altrad_calcbird was calculated by subtracting a constant representing the height difference from the helicopter to the bird when towing and recording data.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>12.63</rdommin>\r\n<rdommax>668.18</rdommax>\r\n<attrunit>m</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>altlas_bird</attrlabl>\r\n<attrdef>bird height above surface, measured by laser altimeter in the EM bird</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>14.76</rdommin>\r\n<rdommax>283.23</rdommax>\r\n<attrunit>m</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>gpsz</attrlabl>\r\n<attrdef>bird height above geoid. The GPSZ (or GPS-Z) value is primarily dependent on the number of available satellites. Although post-processing of GPS data will yield X and Y accuracies on the order of 1 meter, the accuracy of the Z value is usually much less, sometimes in the +/-20 meter range.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>147.31</rdommin>\r\n<rdommax>1272.58</rdommax>\r\n<attrunit>m</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>dtm</attrlabl>\r\n<attrdef>digital terrain model (NAD27 UTM zone 4N); calculated from channel \'GPS-Z\' and the laser altimeter data (channel \'ALTLAS_BIRD\') measured in the bird\'</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>56.34</rdommin>\r\n<rdommax>1211.06</rdommax>\r\n<attrunit>m</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>diurnal_filt</attrlabl>\r\n<attrdef>interpolated diurnal ground magnetic intensity; measured every 1.0 sec.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>55532.77</rdommin>\r\n<rdommax>55610.34</rdommax>\r\n<attrunit>nT</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>diurnal_cor</attrlabl>\r\n<attrdef>diurnal correction - base removed; interpolated from 1.0 second \'diurnal_filt\' measurements</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-1839.58</rdommin>\r\n<rdommax>-1762.02</rdommax>\r\n<attrunit>nT</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>mag_raw</attrlabl>\r\n<attrdef>total magnetic field - spike rejected</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>53323.45</rdommin>\r\n<rdommax>57412.78</rdommax>\r\n<attrunit>nT</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>mag_lag</attrlabl>\r\n<attrdef>total magnetic field - corrected for lag</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>53323.45</rdommin>\r\n<rdommax>57412.78</rdommax>\r\n<attrunit>nT</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>mag_diu</attrlabl>\r\n<attrdef>total magnetic field - diurnal variation removed</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>55120.86</rdommin>\r\n<rdommax>59213.62</rdommax>\r\n<attrunit>nT</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>igrf</attrlabl>\r\n<attrdef>international geomagnetic reference field model 2010, updated for date of flight and elevation variations</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>57113.55</rdommin>\r\n<rdommax>57401.87</rdommax>\r\n<attrunit>nT</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>mag_rmi</attrlabl>\r\n<attrdef>residual magnetic intensity (nT) - final; IGRF model 2010, updated for date of flight and elevation variations, was subtracted from Mag_Diu, then the data were leveled.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-2138.68</rdommin>\r\n<rdommax>1974.11</rdommax>\r\n<attrunit>nT</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>magigrf</attrlabl>\r\n<attrdef>total magnetic field with IGRF removed - final; mag_rmi with constant added back</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>55145.26</rdommin>\r\n<rdommax>59258.05</rdommax>\r\n<attrunit>nT</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cpi900_FILT</attrlabl>\r\n<attrdef>coplanar inphase 900 Hz - unlevelled</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-42.71</rdommin>\r\n<rdommax>420.50</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cpq900_FILT</attrlabl>\r\n<attrdef>coplanar quadrature 900 Hz - unlevelled</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-3.99</rdommin>\r\n<rdommax>381.69</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cxi1000_FILT</attrlabl>\r\n<attrdef>coaxial inphase 1000 Hz - unlevelled</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-18.35</rdommin>\r\n<rdommax>97.69</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cxq1000_FILT</attrlabl>\r\n<attrdef>coaxial quadrature 1000 Hz - unlevelled</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-12.94</rdommin>\r\n<rdommax>108.06</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cxi5500_FILT</attrlabl>\r\n<attrdef>coaxial inphase 5500 Hz - unlevelled</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-9.68</rdommin>\r\n<rdommax>219.23</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cxq5500_FILT</attrlabl>\r\n<attrdef>coaxial quadrature 5500 Hz - unlevelled</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-14.57</rdommin>\r\n<rdommax>298.22</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cpi7200_FILT</attrlabl>\r\n<attrdef>coplanar inphase 7200 Hz - unlevelled</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-27.12</rdommin>\r\n<rdommax>817.69</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cpq7200_FILT</attrlabl>\r\n<attrdef>coplanar quadrature 7200 Hz - unlevelled</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-1.86</rdommin>\r\n<rdommax>1166.28</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cpi56K_FILT</attrlabl>\r\n<attrdef>coplanar inphase 56 kHz - unlevelled</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-38.53</rdommin>\r\n<rdommax>2519.90</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cpq56K_FILT</attrlabl>\r\n<attrdef>coplanar quadrature 56 kHz - unlevelled</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-6.95</rdommin>\r\n<rdommax>2570.54</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cpi900</attrlabl>\r\n<attrdef>coplanar inphase 900 Hz</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-43.27</rdommin>\r\n<rdommax>420.49</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cpq900</attrlabl>\r\n<attrdef>coplanar quadrature 900 Hz</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-1.82</rdommin>\r\n<rdommax>381.54</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cxi1000</attrlabl>\r\n<attrdef>coaxial inphase 1000 Hz</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-12.07</rdommin>\r\n<rdommax>99.78</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cxq1000</attrlabl>\r\n<attrdef>coaxial quadrature 1000 Hz</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-1.15</rdommin>\r\n<rdommax>107.97</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cxi5500</attrlabl>\r\n<attrdef>coaxial inphase 5500 Hz</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-7.38</rdommin>\r\n<rdommax>214.95</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cxq5500</attrlabl>\r\n<attrdef>coaxial quadrature 5500 Hz</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-2.69</rdommin>\r\n<rdommax>298.20</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cpi7200</attrlabl>\r\n<attrdef>coplanar inphase 7200 Hz</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-24.50</rdommin>\r\n<rdommax>817.62</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cpq7200</attrlabl>\r\n<attrdef>coplanar quadrature 7200 Hz</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-2.86</rdommin>\r\n<rdommax>1166.29</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cpi56k</attrlabl>\r\n<attrdef>coplanar inphase 56 kHz</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-48.52</rdommin>\r\n<rdommax>2519.90</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cpq56K</attrlabl>\r\n<attrdef>coplanar quadrature 56 kHz</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-6.85</rdommin>\r\n<rdommax>2570.46</rdommax>\r\n<attrunit>ppm</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>res900</attrlabl>\r\n<attrdef>900 Hz apparent coplanar resistivity; calculated using a pseudo-layer half-space model.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>0.71</rdommin>\r\n<rdommax>1325.00</rdommax>\r\n<attrunit>ohm\xb7m</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>res7200</attrlabl>\r\n<attrdef>7200 Hz apparent coplanar resistivity; calculated using a pseudo-layer half-space model</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>6.09</rdommin>\r\n<rdommax>10750.00</rdommax>\r\n<attrunit>ohm\xb7m</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>res56K</attrlabl>\r\n<attrdef>56 kHz apparent coplanar resistivity; calculated using a pseudo-layer half-space model</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>9.61</rdommin>\r\n<rdommax>60000.00</rdommax>\r\n<attrunit>ohm\xb7m</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>dep900</attrlabl>\r\n<attrdef>apparent depth 900 Hz</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-99.85</rdommin>\r\n<rdommax>305.23</rdommax>\r\n<attrunit>m</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>dep7200</attrlabl>\r\n<attrdef>apparent depth 7200 Hz</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-94.30</rdommin>\r\n<rdommax>75.69</rdommax>\r\n<attrunit>m</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>dep56K</attrlabl>\r\n<attrdef>apparent depth 56 kHz</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-121.57</rdommin>\r\n<rdommax>28.86</rdommax>\r\n<attrunit>m</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>difi</attrlabl>\r\n<attrdef>difference channel based on cxi5500 & cpi7200</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-29.81</rdommin>\r\n<rdommax>91.53</rdommax>\r\n<attrunit>unitless</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>difq</attrlabl>\r\n<attrdef>difference channel based on cxq5500 & cpq7200</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>-31.75</rdommin>\r\n<rdommax>38.32</rdommax>\r\n<attrunit>unitless</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cppl</attrlabl>\r\n<attrdef>coplanar powerline monitor</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>0.00</rdommin>\r\n<rdommax>0.00</rdommax>\r\n<attrunit>unitless</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cxsp</attrlabl>\r\n<attrdef>coaxial spherics monitor</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>0.00</rdommin>\r\n<rdommax>0.00</rdommax>\r\n<attrunit>unitless</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>cpsp</attrlabl>\r\n<attrdef>coplanar spherics monitor</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>0.00</rdommin>\r\n<rdommax>0.00</rdommax>\r\n<attrunit>unitless</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n</detailed>\r\n<detailed>\r\n<enttyp>\r\n<ealname>GRIDS</ealname>\r\n<enttypl>GPR2011-2GridsAsGRD.zip and GPR2011-2GridsAsERM.zip</enttypl>\r\n<enttypd>\r\nThe zip files contain the 11 grids and supporting files for this publication in either Geosoft binary float (GRD) format or ER Mapper (ERS) format. Each grid is in NAD27 datum, UTM Zone 4N, and has a 25m cell size with x and y in meters. An image from each of the grids is provided as Geotiffs and KMZ files. Grid files are listed below as attributes.\r\n>\r\nA Geosoft projection file (GI) is included for automatic projection of each Geosoft grid file when using Oasis Montaj, the Geosoft software. Setting the projection can also be done manually in Geosoft without the GI file.\r\n>\r\nEach ER Mapper grid consists of two files, a header (projection) file (.ERS) and a data file (no extension). Both ER Mapper files are necessary to view a grid or to convert it to another software format.\r\n</enttypd>\r\n<enttypds>Fugro Airborne Surveys</enttypds>\r\n</enttyp>\r\n<attr>\r\n<attrlabl>Idi_MagDiu</attrlabl>\r\n<attrdef>Partially processed total magnetic field (nT); processing included removal of magnetic spikes, correction for lag, and removal of diurnal variations. Not shown as a map.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Grid file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_MagRMI</attrlabl>\r\n<attrdef>Residual magnetic field (nT) - final; IGRF model 2010, updated for date of flight and elevation variations, was subtracted from Mag_Diu, then the data were leveled. Shown in map numbers GPR2011-2-1A, 1B, 1C, 2A, 2B, 2C, 7A, 7B, and 7C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Grid file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_MagIGRF</attrlabl>\r\n<attrdef>Total magnetic field (nT) - final, with IGRF removed; residual magnetic field (Mag_RMI) with constant added back in. Not produced as a map. However Idi_RMI (also produced as maps) is directly the same as Idi_MagIGRF except off by a constant.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Grid file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_1VD</attrlabl>\r\n<attrdef>First vertical derivative \'dz\' (nT/m) of the total magnetic field with IGRF removed; also referred to as \'calculated vertical gradient\' (cvg). Shown in map numbers GPR2011-2-3A, 3B, and 3C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Grid file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_ASig</attrlabl>\r\n<attrdef>Analytic signal (nT/m) calculated from the total magnetic field with IGRF removed. Shown in map numbers GPR2011-2-4A, 4B, 4C, 5A, 5B, and 5C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Grid file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_TiltDer</attrlabl>\r\n<attrdef>Tilt derivative (degrees) of the total magnetic field with IGRF removed. Shown in map numbers GPR2011-2-6A and 6B. Contours from the tilt derivative are shown upon a color shadows residual magnetic field (Idi_MagRMI) in maps GPR2011-2-7A, 7B and 7C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Grid file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res56k</attrlabl>\r\n<attrdef>Apparent coplanar resistivity (ohm-m) for 56,000 (56k) Hz.; calculated using a pseudo-layer half-space model. Shown in map numbers GPR2011-2-8A, 8B,8C, 9A, 9B, and 9C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Grid file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res7200</attrlabl>\r\n<attrdef>Apparent coplanar resistivity (ohm-m) for 7200 Hz.; calculated using a pseudo-layer half-space model. Shown in map numbers GPR2011-2-10A, 10B, 10C, 11A, 11B, and 11C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Grid file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res900</attrlabl>\r\n<attrdef>Apparent coplanar resistivity (ohm-m) for 900 Hz.; calculated using a pseudo-layer half-space model. Shown in map numbers GPR2011-2-12A, 12B, 12C, 13A, 13B, and 13C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Grid file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_DTM</attrlabl>\r\n<attrdef>Digital terrain or elevation model (m). Not shown as a map.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Grid file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_AltLasBird</attrlabl>\r\n<attrdef>EM bird height (m) above surface, measured by Laser altimeter in EM bird. Not shown as a map.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Grid file</udom>\r\n</attrdomv>\r\n</attr>\r\n</detailed>\r\n<detailed>\r\n<enttyp>\r\n<ealname>GEOTIFFS</ealname>\r\n<enttypl>GPR2011-2_GEOTIFFS_NAD27_z4N.zip</enttypl>\r\n<enttypd>The zip file \'GPR2011-2_TIFS_NAD27_z4N.zip\' contains Geotiffs in NAD27, UTM Zone 4N. Each of the 11 grids is represented in Geotiff (TIF) format. The images shown in 7 of the Geotiffs are the same images used on the maps in this publication; no maps were made of the other 4 images. Map numbers are given below for the appropriate Geotiff attribute definition; the correlation between Geotiff image and map number is also given in \'gpr2011_002_readme.pdf\'.</enttypd>\r\n<enttypds>Fugro Airborne Surveys</enttypds>\r\n</enttyp>\r\n<attr>\r\n<attrlabl>Idi_MagDiu</attrlabl>\r\n<attrdef>Partially processed total magnetic field (nT); processing included removal of magnetic spikes, correction for lag, and removal of diurnal variations. Not shown as a map.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Geotiff file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_MagRMI</attrlabl>\r\n<attrdef>Residual magnetic field (nT) - final; IGRF model 2010, updated for date of flight and elevation variations, was subtracted from Mag_Diu, then the data were leveled. Shown in map numbers GPR2011-2-1A, 1B, 1C, 2A, 2B, 2C, 7A, 7B, and 7C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Geotiff file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_MagIGRF</attrlabl>\r\n<attrdef>Total magnetic field (nT) - final, with IGRF removed; residual magnetic field (Mag_RMI) with constant added back in. Not produced as a map. However Idi_RMI (also produced as maps) is directly the same as Idi_MagIGRF except off by a constant.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Geotiff file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_1VD</attrlabl>\r\n<attrdef>First vertical derivative \'dz\' (nT/m) of the total magnetic field with IGRF removed; also referred to as \'calculated vertical gradient\' (cvg). Shown in map numbers GPR2011-2-3A, 3B, and 3C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Geotiff file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_ASig</attrlabl>\r\n<attrdef>Analytic signal (nT/m) calculated from the total magnetic field with IGRF removed. Shown in map numbers GPR2011-2-4A, 4B, 4C, 5A, 5B, and 5C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Geotiff file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_TiltDer</attrlabl>\r\n<attrdef>Tilt derivative (degrees) of the total magnetic field with IGRF removed. Shown in map numbers GPR2011-2-6A and 6B. Contours from the tilt derivative are shown upon a color shadows residual magnetic field (Idi_MagRMI) in maps GPR2011-2-7A, 7B and 7C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Geotiff file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res56k</attrlabl>\r\n<attrdef>Apparent coplanar resistivity (ohm-m) for 56,000 (56k) Hz.; calculated using a pseudo-layer half-space model. Shown in map numbers GPR2011-2-8A, 8B, 8C, 9A, 9B, and 9C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Geotiff file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res7200</attrlabl>\r\n<attrdef>Apparent coplanar resistivity (ohm-m) for 7200 Hz.; calculated using a pseudo-layer half-space model. Shown in map numbers GPR2011-2-10A, 10B, 10C, 11A, 11B, and 11C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Geotiff file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res900</attrlabl>\r\n<attrdef>Apparent coplanar resistivity (ohm-m) for 900 Hz.; calculated using a pseudo-layer half-space model. Shown in map numbers GPR2011-2-12A, 12B, 12C, 13A, 13B, and 13C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Geotiff file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_DTM</attrlabl>\r\n<attrdef>Digital terrain or elevation model (m). Not shown as a map.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Geotiff file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_AltLasBird</attrlabl>\r\n<attrdef>EM bird height (m) above surface, measured by Laser altimeter in EM bird. Not shown as a map.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Geotiff file</udom>\r\n</attrdomv>\r\n</attr>\r\n</detailed>\r\n<detailed>\r\n<enttyp>\r\n<ealname>KMZs</ealname>\r\n<enttypl>GPR2011-2_KMZS_WGS84.zip</enttypl>\r\n<enttypd>The zip file \'GPR2011-2KMZS_WGS84.zip\' contains Google Earth KMZ files in Geographic Coordinate System (Simple Cylindrical projection) with a WGS84 datum. Each of the 11 grids is included. The images shown in 7 of the KMZ files are the same images used on the maps in this publication; no maps were made of the other 4 images. Map numbers are given below for the appropriate KMZ attribute definition; the correlation between KMZ image and map number is also given in \'gpr2011_002_readme.pdf\'.</enttypd>\r\n<enttypds>Fugro Airborne Surveys</enttypds>\r\n</enttyp>\r\n<attr>\r\n<attrlabl>Idi_MagDiu</attrlabl>\r\n<attrdef>Partially processed total magnetic field (nT); processing included removal of magnetic spikes, correction for lag, and removal of diurnal variations. Not shown as a map.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>KMZ file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_MagRMI</attrlabl>\r\n<attrdef>Residual magnetic field (nT) - final; IGRF model 2010, updated for date of flight and elevation variations, was subtracted from Mag_Diu, then the data were leveled. Shown in map numbers GPR2011-2-1A, 1B, 1C, 2A, 2B, 2C, 7A, 7B, and 7C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>KMZ file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_MagIGRF</attrlabl>\r\n<attrdef>Total magnetic field (nT) - final, with IGRF removed; residual magnetic field (Mag_RMI) with constant added back in. Not produced as a map. However Idi_RMI (also produced as maps) is directly the same as Idi_MagIGRF except off by a constant.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>KMZ file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_1VD</attrlabl>\r\n<attrdef>First vertical derivative \'dz\' ( nT/m) of the total magnetic field with IGRF removed; also referred to as \'calculated vertical gradient\' (cvg). Shown in map numbers GPR2011-2-3A, 3B, and 3C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>KMZ file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_ASig</attrlabl>\r\n<attrdef>Analytic signal (nT/m) calculated from the total magnetic field with IGRF removed. Shown in map numbers GPR2011-2-4A, 4B, 4C, 5A, 5B, and 5C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>KMZ file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_TiltDer</attrlabl>\r\n<attrdef>Tilt derivative (degrees) of the total magnetic field with IGRF removed. Shown in map numbers GPR2011-2-6A and 6B. Contours from the tilt derivative are shown upon a color shadows residual magnetic field (Idi_MagRMI) in maps GPR2011-2-7A, 7B and 7C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>KMZ file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res56k</attrlabl>\r\n<attrdef>Apparent coplanar resistivity (ohm-m) for 56,000 (56k) Hz.; calculated using a pseudo-layer half-space model. Shown in map numbers GPR2011-2-8A, 8B, 8C, 9A, 9B, and 9C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>KMZ file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res7200</attrlabl>\r\n<attrdef>Apparent coplanar resistivity (ohm-m) for 7200 Hz.; calculated using a pseudo-layer half-space model. Shown in map numbers GPR2011-2-10A, 10B, 10C, 11A, 11B, and 11C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>KMZ file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res900</attrlabl>\r\n<attrdef>Apparent coplanar resistivity (ohm-m) for 900 Hz.; calculated using a pseudo-layer half-space model. Shown in map numbers GPR2011-2-12A, 12B, 12C, 13A, 13B, and 13C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>KMZ file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_DTM</attrlabl>\r\n<attrdef>Digital terrain or elevation model (m). Not shown as a map.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>KMZ file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_AltLasBird</attrlabl>\r\n<attrdef>EM bird height (m) above surface, measured by Laser altimeter in EM bird. Not shown as a map.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>KMZ file</udom>\r\n</attrdomv>\r\n</attr>\r\n</detailed>\r\n<detailed>\r\n<enttyp>\r\n<ealname>VECTORS</ealname>\r\n<enttypl>GPR2011-2_VECTORS.zip</enttypl>\r\n<enttypd>Data contours produced for the maps are provided in ESRI shape file format. Except for maps GPR2011-2-6 and GPR2011-2-7, the vector files are shown on the maps without topography. Additional vector files included are the flight path, and the Alaska Section Grid and a UTM grid for the map area.</enttypd>\r\n<enttypds>Fugro Airborne Surveys</enttypds>\r\n</enttyp>\r\n<attr>\r\n<attrlabl>Idi_magRMI_1</attrlabl>\r\n<attrdef>One of four ESRI shape files containing information for the residual magnetic field data contours. This file contains contours for 5 and 10 nT. These lines are the thinnest on the residual magnetic field maps. The 10 nT line is solid, and the 5 nT line is dashed. Shown in map numbers GPR2011-2-1A, 1B, 2A, and 2B.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_magRMI_2</attrlabl>\r\n<attrdef>One of four ESRI shape files containing information for the residual magnetic field data contours. This file contains contours for 50 nT. These lines are the middle thickness on the residual magnetic field maps and are solid. Shown in map numbers GPR2011-2-1A, 1B, 2A, and 2B.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_magRMI_3</attrlabl>\r\n<attrdef>One of four ESRI shape files containing information for the residual magnetic field data contours. This file contains contours for 250 nT. These lines are the thickest on the residual magnetic field maps and are solid. Shown in map numbers GPR2011-2-1A, 1B, 2A, and 2B.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_magRMI_4</attrlabl>\r\n<attrdef>One of four ESRI shape files containing information for the residual magnetic field data contours. This file contains labels for the contours. The labels are made of vector lines, not alphanumeric characters. Shown in map numbers GPR2011-2-1A, 1B, 2A, and 2B.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_ASig_1</attrlabl>\r\n<attrdef>One of four ESRI shape files containing information for the analytic signal contours. This file contains contours for 0.1 and 0.2 nT/meter. These lines are the thinnest on the analytic signal maps. The 0.1 nT/meter line is dashed; the 0.2 nT/meter line is solid. Shown in map numbers GPR2011-2-4A, 4B, 4C, 5A, 5B, and 5C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_ASig_2</attrlabl>\r\n<attrdef>One of four ESRI shape files containing information for the analytic signal contours. This file contains contours for 1.0 nT/meter. These lines are the middle thickness on the analytic signal maps and are solid. Shown in map numbers GPR2011-2-4A, 4B, 4C, 5A, 5B, and 5C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_ASig_3</attrlabl>\r\n<attrdef>One of four ESRI shape files containing information for the analytic signal contours. This file contains contours for 5.0 nT/meter. These lines are the thickest on the analytic signal maps and are solid. Shown in map numbers GPR2011-2-4A, 4B, 4C, 5A, 5B, and 5C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_ASig_4</attrlabl>\r\n<attrdef>One of four ESRI shape files containing information for the analytic signal contours. This file contains labels for the contours. The labels are made of vector lines, not alphanumeric characters. Shown in map numbers GPR2011-2-4A, 4B, 4C, 5A, 5B, and 5C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_TILTDER_p45</attrlabl>\r\n<attrdef>One of eight ESRI shape files containing information for the magnetic tilt derivative contours. Two line weights are used in the tilt derivative contours; all are solid. This file contains contours for positive 45 (+45) degrees; the contours are thick and cyan. Tilt derivative contours are shown in map numbers GPR2011-2-6A, 6B, 7A, and 7B.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_TiltDer_p30</attrlabl>\r\n<attrdef>One of eight ESRI shape files containing information for the magnetic tilt derivative contours. Two line weights are used in the tilt derivative contours; all are solid. This file contains contours for positive 30 (+30) degrees; the contours are thin and black. Tilt derivative contours are shown in map numbers GPR2011-2-6A, 6B, 7A, and 7B.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_TiltDer_p15</attrlabl>\r\n<attrdef>One of eight ESRI shape files containing information for the magnetic tilt derivative contours. Two line weights are used in the tilt derivative contours; all are solid. This file contains contours for positive 15 (+15) degrees; the contours are thin and black. Tilt derivative contours are shown in map numbers GPR2011-2-6A, 6B, 7A, and 7B.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys and Laurel Burns</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_TiltDer_0</attrlabl>\r\n<attrdef>One of eight ESRI shape files containing information for the magnetic tilt derivative contours. Two line weights are used in the tilt derivative contours; all are solid. This file contains contours for 0 degrees; the contours are thick and black. Tilt derivative contours are shown in map numbers GPR2011-2-6A, 6B, 7A, and 7B.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys and Laurel Burns</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_TiltDer_n15</attrlabl>\r\n<attrdef>One of eight ESRI shape files containing information for the magnetic tilt derivative contours. Two line weights are used in the tilt derivative contours; all are solid. This file contains contours for negative 15 (-15) degrees; the contours are thin and black. Tilt derivative contours are shown in map numbers GPR2011-2-6A, 6B, 7A, and 7B.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_TiltDer_n30</attrlabl>\r\n<attrdef>One of eight ESRI shape files containing information for the magnetic tilt derivative contours. Two line weights are used in the tilt derivative contours; all are solid. This file contains contours for negative 30 (-30) degrees; the contours are thin and black. Tilt derivative contours are shown in map numbers GPR2011-2-6A, 6B, 7A, and 7B.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_TiltDer_n45</attrlabl>\r\n<attrdef>One of eight ESRI shape files containing information for the magnetic tilt derivative contours. Two line weights are used in the tilt derivative contours; all are solid. This file contains contours for negative 45 (-45) degrees; the contours are thick and red. numbers GPR2011-2-6A, 6B, 7A, and 7B.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_TiltDer_Labels</attrlabl>\r\n<attrdef>One of eight ESRI shape files containing information for the magnetic tilt derivative contours. This file contains labels for the contours. The labels are made of vector lines, not alphanumeric characters. Tilt derivative contours are shown in map numbers GPR2011-2-6A, 6B, 7A, and 7B.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res56k_1</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 56,000 Hz coplanar apparent resistivity contours. The apparent resistivity maps use a logarithmic scale for the contours. This file contains contours for the minor intervals (i.e., 125, 200, 300, 500, 800, 1,250, 2,000, 3,000, 5,000, 8,000, and 12,500 ohm-m) between the decades of 100, 1,000, 10,000, and 100,000. These lines are the thinnest on the 56,000 Hz coplanar apparent resistivity maps and are solid. Shown in map numbers GPR2011-2-8A, 8B, 8C, 9A, 9B, and 9C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res56k_2</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 56,000 Hz coplanar apparent resistivity contours. The apparent resistivity maps use a logarithmic scale for the contours. This file contains contours for the major intervals (i.e., 150, 250, 400, 600, 1,500, 2,500, 4,000, 6,000, and 15,000 ohm-m) between the decades of 100, 1,000, 10,000, and 100,000. These lines are the middle thickness on the 56,000 Hz coplanar apparent resistivity maps and are solid. Shown in map numbers GPR2011-2-8A, 8B, 8C, 9A, 9B, and 9C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res56k_3</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 56,000 Hz coplanar apparent resistivity contours. The apparent resistivity maps use a logarithmic scale for the contours. This file contains contours for the decades 100, 1,000, and 10,000 ohm-m. These lines are the thickest on the 56,000 Hz coplanar apparent resistivity maps and are solid. Shown in map numbers GPR2011-2-8A, 8B, 8C, 9A, 9B, and 9C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res56k_4</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 56,000 Hz coplanar apparent resistivity contours. This file contains labels for the contours. The labels are made of vector lines, not alphanumeric characters. Shown in map numbers GPR2011-2-8A, 8B, 8C, 9A, 9B, and 9C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res56k_5</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 56,000 Hz coplanar apparent resistivity contours. This file contains \'triangles\' that are used to indicate the lowest contours in an area. The \'triangles\' (composed of scribbled infill) are attached to the lowest contour and point in the direction of the low. Shown in map numbers GPR2011-2-8A, 8B, 8C, 9A, 9B, and 9C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res7200_1</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 7200 Hz coplanar apparent resistivity contours. The apparent resistivity maps use a logarithmic scale for the contours. This file contains contours for the minor intervals (i.e., 125, 200, 300, 500, 800, 1,250, 2,000, 3,000, 5,000, and 8,000 ohm-m) between the decades of 100, 1,000, and 10,000. These lines are the thinnest on the 7200 Hz coplanar apparent resistivity maps and are solid. Shown in map numbers GPR2011-2-10A, 10B, 10C, 11A, 11B, and 11C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res7200_2</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 7200 Hz coplanar apparent resistivity contours. The apparent resistivity maps use a logarithmic scale for the contours. This file contains contours for the major intervals (i.e., 150, 250, 400, 600, 1,500, 2,500, 4,000, and 6,000 ohm-m) between the decades of 100, 1,000, and 10,000. These lines are the middle thickness on the 7200 Hz coplanar apparent resistivity maps and are solid. Shown in map numbers GPR2011-2-10A, 10B, 10C, 11A, 11B, and 11C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res7200_3</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 7200 Hz coplanar apparent resistivity contours. The apparent resistivity maps use a logarithmic scale for the contours. This file contains contours for the decades 100, 1,000, and 10,000 ohm-m. These lines are the thickest on the 7200 Hz coplanar apparent resistivity maps and are solid. Shown in map numbers GPR2011-2-10A, 10B, 10C, 11A, 11B, and 11C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res7200_4</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 7200 Hz coplanar apparent resistivity contours. This file contains labels for the contours. The labels are made of vector lines, not alphanumeric characters. Shown in map numbers GPR2011-2-10A, 10B, 10C, 11A, 11B, and 11C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res7200_5</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 7200 Hz coplanar apparent resistivity contours. This file contains \'triangles\' that are used to indicate the lowest contours in an area. The \'triangles\' (composed of scribbled infill) are attached to the lowest contour and point in the direction of the low. Shown in map numbers GPR2011-2-10A, 10B, 10C, 11A, 11B, and 11C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res900_1</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 900 Hz coplanar apparent resistivity contours. The apparent resistivity maps use a logarithmic scale for the contours. This file contains contours for the minor intervals (i.e., 125, 200, 300, 500, 800, and 1,250 ohm-m) between the decades of 100, 1,000, and 10,000. These lines are the thinnest on the 900 Hz coplanar apparent resistivity maps and are solid. Shown in map numbers GPR2011-2-12A, 12B, 12C, 13A, 13B, and 13C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res900_2</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 900 Hz coplanar apparent resistivity contours. The apparent resistivity maps use a logarithmic scale for the contours. This file contains contours for the major intervals (i.e., 150, 250, 400, and 600 ohm-m) between the decades of 100, 1,000, and 10,000. These lines are the middle thickness on the 900 Hz coplanar apparent resistivity maps and are solid. Shown in map numbers GPR2011-2-12A, 12B, 12C, 13A, 13B, and 13C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res900_3</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 900 Hz coplanar apparent resistivity contours. The apparent resistivity maps use a logarithmic scale for the contours. This file contains contours for the decades 100 and 1,000 ohm-m. These lines are the thickest on the 900 Hz coplanar apparent resistivity maps and are solid. Shown in map numbers GPR2011-2-12A, 12B, 12C, 13A, 13B, and 13C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res900_4</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 900 Hz coplanar apparent resistivity contours. This file contains labels for the contours. The labels are made of vector lines, not alphanumeric characters. Shown in map numbers GPR2011-2-12A, 12B, 12C, 13A, 13B, and 13C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_Res900_5</attrlabl>\r\n<attrdef>One of five ESRI shape files containing information for the 900 Hz coplanar apparent resistivity contours. This file contains \'triangles\' that are used to indicate the lowest contours in an area. The \'triangles\' (composed of scribbled infill) are attached to the lowest contour and point in the direction of the low. Shown in map numbers GPR2011-2-12A, 12B, 12C, 13A, 13B, and 13C.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_FP_1</attrlabl>\r\n<attrdef>One of four ESRI shape files containing information about the flight path. This file contains all flight lines.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file containing lines for all flight lines</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_FP_3</attrlabl>\r\n<attrdef>One of four ESRI shape files containing information about the flight path. This file contains tic marks and associated alphanumeric numbers, for fiducial marks (FIDs) ending in \'00\' and \'50\' as well as tic marks for beginning and ending FIDs regardless of the FID value. Lyn Vanderstarren of Fugro Airborne surveys manually corrected the placement of the text.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file containing lines and numbers for major FIDs and beginning and ending FIDs</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_FP_2</attrlabl>\r\n<attrdef>One of four ESRI shape files containing information about the flight path. This file contains tic marks for fiducial marks (FIDs) ending in \'10\', \'20\', \'30\', \'40\', \'60\', \'70\', \'80\', and \'90\'. These fiducial tics are not labeled with any numbers.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file containing lines for minor FIDs</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_FP_1001</attrlabl>\r\n<attrdef>One of four ESRI shape files containing information about the flight path. This file contains individual alphanumeric characters that form the line numbers and flight numbers. Between each line number and associated flight number, a \'<\' or \'>\' points in the direction of flight.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file containing lines for alphanumeric characters</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Idi_SecGrid</attrlabl>\r\n<attrdef>Alaska PLSS Section Grid (original file name \'pls_section\') for the map areas. Modified by Fugro Airborne Surveys for line width, color, township and range numbers to use on the maps.</attrdef>\r\n<attrdefs>Alaska Department of Natural Resources - Land Records Information Section; L.E. Burns, Division of Geological & Geophysical Surveys; and Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>vector file containing alphanumeric characters</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>IDI_UTMGrid</attrlabl>\r\n<attrdef>A UTM grid for the maps areas produced by Fugro Airborne Surveys. Contains non-alphanumeric labels around the edges of the map sheets.</attrdef>\r\n<attrdefs>Fugro Airborne Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>file containing alphanumeric characters</udom>\r\n</attrdomv>\r\n</attr>\r\n</detailed>\r\n<overview>\r\n<eaover>\r\nMaps are provided in PDF and HPGL/2 format, and are downloadable in zip files by data format. The HPGL/2 maps are divided into three files with the range of map numbers included at the end of the file name. The HPGL/2 files have brighter and more gradational colors, and sharper topography than the Adobe Acrobat files. See \'Technical_Prerequisites\' section for more information on printing HPGL/2 maps.\r\n\r\nThree map sheets, labeled \'A\', \'B\' and \'C\', are needed to cover the survey area at a scale of 1:63,360 (inch-to-a-mile). Most geophysical images are placed on two maps, one with topography and one with data contours and no topography. Thirteen different maps (39 map sheets) are included in this publication. Bounding coordinates for the sheets are given immediately below.\r\n\r\n** \'A\' maps - northern part of area ******\r\n> West, -157.25\r\n> East, -156.17\r\n> North, 63.17\r\n> South, 62.83\r\n\r\n** \'B\' maps - middle part of area *******\r\n> West, -157.33\r\n> East, -156.42\r\n> North, 62.83\r\n> South, 65.50\r\n\r\n** \'C\' maps - southwestern part of area *******\r\n> West, -158.08\r\n> East, -157.33\r\n> North, 62.75\r\n> South, 65.42\r\n\r\nAuthors and titles of the maps are like the example given below:\r\n\r\nBurns, L.E., Fugro Airborne Surveys Corp., and Fugro GeoServices, Inc., 2011, Residual magnetic field of the Iditarod Survey Area, Innoko, Iditarod, and Ophir mining districts, western Alaska, part of Iditarod and Ophir quadrangles: Alaska Division of Geological & Geophysical Surveys Geophysical Report 2011-2-1A, 1 sheet, scale 1:63,360.\r\n\r\n> Publication No Part of Map Title\t Includes\r\n\r\n> GPR2011-2-1 Residual magnetic field topography\r\n> GPR2011-2-2 Residual magnetic field with data contours\r\n> GPR2011-2-3 First vertical derivative of the magnetic field topography\r\n> GPR2011-2-4 Analytic Signal topography\r\n> GPR2011-2-5 Analytic Signal with data contours\r\n> GPR2011-2-6 Magnetic tilt derivative and data contours topography\r\n> GPR2011-2-7 Color shadow residual magnetic field with magnetic\r\n> tilt derivative contours topography\r\n> GPR2011-2-8 56K Hz coplanar apparent resistivity topography\r\n> GPR2011-2-9 56K Hz coplanar apparent resistivity with data contours\r\n> GPR2011-2-10 7200 Hz coplanar apparent resistivity topography\r\n> GPR2011-2-11 7200 Hz coplanar apparent resistivity with data contours\r\n> GPR2011-2-12 900 Hz coplanar apparent resistivity topography\r\n> GPR2011-2-13 900 Hz coplanar apparent resistivity with data contours\r\n</eaover>\r\n<eadetcit>L.E. Burns, Division of Geological & Geophysical Surveys, and Fugro Airborne Surveys</eadetcit>\r\n</overview>\r\n<detailed>\r\n<enttyp>\r\n<ealname>MAPS</ealname>\r\n<enttypl>GPR2011-2_MapsAsPDFS.zip, GPR2011-2_MapsAsHPGL2_1-5.zip, GPR2011-2_MapsAsHPGL2_6-8.zip, and GPR2011-2_MapsAsHPGL2_9-13.zip</enttypl>\r\n<enttypd>Zip file names indicate the map numbers and format included in the zip file.</enttypd>\r\n<enttypds>Fugro Airborne Surveys</enttypds>\r\n</enttyp>\r\n</detailed>\r\n</eainfo>\r\n<distinfo>\r\n<distrib>\r\n<cntinfo>\r\n<cntorgp>\r\n<cntorg>State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS)</cntorg>\r\n</cntorgp>\r\n<cntpos>Natural Resource Technician</cntpos>\r\n<cntaddr>\r\n<addrtype>mailing and physical address</addrtype>\r\n<address>3354 College Road</address>\r\n<city>Fairbanks</city>\r\n<state>AK</state>\r\n<postal>99709-3707</postal>\r\n<country>USA</country>\r\n</cntaddr>\r\n<cntvoice>907-451-5020</cntvoice>\r\n<cnttdd>None available</cnttdd>\r\n<cntfax>907-451-5050</cntfax>\r\n<cntemail>dggspubs@alaska.gov</cntemail>\r\n<hours>8 am to 4:30 pm, Monday through Friday, except State holidays</hours>\r\n<cntinst>Please view our website (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address above whenever possible.</cntinst>\r\n</cntinfo>\r\n</distrib>\r\n<resdesc>Geophysical Report 2011-2</resdesc>\r\n<distliab>The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user\'s purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska\'s liability to the requester or anyone else exceed the fee paid for the electronic service or product.</distliab>\r\n<stdorder>\r\n<nondig>Maps from current publications are available on paper or Mylar. Please ask for the maps to be printed from HPGL/2 files to ensure the best quality image. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turn around time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping ammount.</nondig>\r\n<fees>Variable</fees>\r\n</stdorder>\r\n<stdorder>\r\n<digform>\r\n<digtinfo>\r\n<formname>Geosoft binary float (GRD)</formname>\r\n<formvern>Unknown</formvern>\r\n</digtinfo>\r\n<digtopt>\r\n<offoptn>\r\n<offmedia>DVD</offmedia>\r\n<recfmt>Unspecified</recfmt>\r\n</offoptn>\r\n</digtopt>\r\n</digform>\r\n<digform>\r\n<digtinfo>\r\n<formname>ER Mapper (ERS)</formname>\r\n<formvern>Unknown</formvern>\r\n</digtinfo>\r\n<digtopt>\r\n<offoptn>\r\n<offmedia>DVD</offmedia>\r\n<recfmt>Unspecified</recfmt>\r\n</offoptn>\r\n</digtopt>\r\n</digform>\r\n<digform>\r\n<digtinfo>\r\n<formname>Geosoft binary database (GDB)</formname>\r\n<formvern>Unknown</formvern>\r\n</digtinfo>\r\n<digtopt>\r\n<offoptn>\r\n<offmedia>DVD</offmedia>\r\n<recfmt>Unspecified</recfmt>\r\n</offoptn>\r\n</digtopt>\r\n</digform>\r\n<digform>\r\n<digtinfo>\r\n<formname>Geosoft ASCII (XYZ)</formname>\r\n<formvern>Unknown</formvern>\r\n</digtinfo>\r\n<digtopt>\r\n<offoptn>\r\n<offmedia>DVD</offmedia>\r\n<recfmt>Unspecified</recfmt>\r\n</offoptn>\r\n</digtopt>\r\n</digform>\r\n<digform>\r\n<digtinfo>\r\n<formname>ESRI Shape (SHP)</formname>\r\n<formvern>Unknown</formvern>\r\n</digtinfo>\r\n<digtopt>\r\n<offoptn>\r\n<offmedia>DVD</offmedia>\r\n<recfmt>Unspecified</recfmt>\r\n</offoptn>\r\n</digtopt>\r\n</digform>\r\n<digform>\r\n<digtinfo>\r\n<formname>MapInfo Professional Tab (TAB)</formname>\r\n<formvern>Unknown</formvern>\r\n</digtinfo>\r\n<digtopt>\r\n<offoptn>\r\n<offmedia>DVD</offmedia>\r\n<recfmt>Unspecified</recfmt>\r\n</offoptn>\r\n</digtopt>\r\n</digform>\r\n<digform>\r\n<digtinfo>\r\n<formname>PDF</formname>\r\n<formvern>1.5</formvern>\r\n</digtinfo>\r\n<digtopt>\r\n<offoptn>\r\n<offmedia>DVD</offmedia>\r\n<recfmt>Unspecified</recfmt>\r\n</offoptn>\r\n</digtopt>\r\n</digform>\r\n<digform>\r\n<digtinfo>\r\n<formname>HPGL/2</formname>\r\n<formvern>unknown</formvern>\r\n</digtinfo>\r\n<digtopt>\r\n<offoptn>\r\n<offmedia>DVD</offmedia>\r\n<recfmt>Unspecified</recfmt>\r\n</offoptn>\r\n<onlinopt>\r\n<computer>\r\n<networka>\r\n<networkr>http://dx.doi.org/10.14509/22842</networkr>\r\n</networka>\r\n</computer>\r\n</onlinopt>\r\n</digtopt>\r\n</digform>\r\n<fees>Digital files on DVD are available for $10 plus shipping and are available for no charge when downloaded.</fees>\r\n<ordering>Order by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: cash, check, money order, VISA, or MasterCard. The geophysics page of the DGGS website (http://www.dggs.alaska.gov/geophysics/) has geophysical order forms for this project and others.</ordering>\r\n<turnarnd>Digital downloads: less than 30 minutes for most files. Free FTP access is available upon request for files not available on the web. Offline CD/DVD-ROMs: 1-2 weeks unless special arrangements are made and an express fee is paid.</turnarnd>\r\n</stdorder>\r\n<custom>Custom views or processing may be requested. Please contact Laurel Burns by phone (907-451-5021), e-mail (laurel.burns@alaska.gov), or fax (907-451-5050) to discuss custom processing availability, fees, and turnaround time.</custom>\r\n<techpreq>Software with ability to use, import, or convert Geosoft float GRD, Geosoft binary GDB or ASCII XYZ files, Autocad DXF files, ESRI Shape files, MapInfo Professional TAB files, Adobe Acrobat PDF, Google Earth files, and text files. Free downloadable interfaces to view or convert the gridded and dxf files are available at the Geosoft website (http://www.geosoft.com; Oasis Montaj viewer). The KMZ files can be dragged and dropped into the \'My Places\' folder of the free downloadable \'Google Earth\' software. Freeware software \'printfile\' (http://www.lerup.com/printfile) prints HPGL/2 files easily on compatible printers. The HPGL/2 files have brighter colors and sharper topography than the PDF maps and should be used for printing when possible. The PDF format maps are the only maps digitally viewable in this publication.</techpreq>\r\n</distinfo>\r\n<metainfo>\r\n<metd>20111013</metd>\r\n<metrd>20111013</metrd>\r\n<metfrd>20140621</metfrd>\r\n<metc>\r\n<cntinfo>\r\n<cntorgp>\r\n<cntorg>State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS)</cntorg>\r\n</cntorgp>\r\n<cntpos>Geophysicist (Laurel Burns)</cntpos>\r\n<cntaddr>\r\n<addrtype>mailing and physical address</addrtype>\r\n<address>3354 College Road</address>\r\n<city>Fairbanks</city>\r\n<state>AK</state>\r\n<postal>99709-3707</postal>\r\n<country>USA</country>\r\n</cntaddr>\r\n<cntvoice>907-451-5021</cntvoice>\r\n<cnttdd>None available</cnttdd>\r\n<cntfax>907-451-5050</cntfax>\r\n<cntemail>dggspubs@alaska.gov</cntemail>\r\n<hours>8 am to 4:30 pm, Monday through Friday, except State holidays.</hours>\r\n<cntinst>Please contact us through the e-mail address above whenever possible.</cntinst>\r\n</cntinfo>\r\n</metc>\r\n<metstdn>FGDC Content Standards for Digital Geospatial Metadata</metstdn>\r\n<metstdv>FGDC-STD-001-1998</metstdv>\r\n<mettc>local time</mettc>\r\n<metac>none</metac>\r\n<metuc>If the user has modified the data in any way the user is obligated to describe the types of modifications the user has made in the supporting metadata file. User specifically agrees not to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.</metuc>\r\n<metextns>\r\n<onlink>http://www.dggs.alaska.gov/metadata/dggs.ext</onlink>\r\n<metprof>dggs metadata extensions</metprof>\r\n</metextns>\r\n</metainfo>\r\n</metadata>', 42643, 42644, 'invalid start byte')
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Date Created: 2026-01-17 20:07:00.037194
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Date Created: 2026-01-17 20:09:32.967269
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Date Created: 2026-01-17 20:08:12.300504
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Type: TransformationException
Date Created: 2026-01-17 20:12:33.203116
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Date Created: 2026-01-17 20:10:14.130531
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Error Message: alaska-division-of-geological-and-geophysical-surveys https://dggs.alaska.gov/webpubs/metadata/PIR2008-3A.xml failed to prepare record for harvest :: UnicodeDecodeError('utf-8', b'<?xml version="1.0" encoding="ISO-8859-1"?>\r\n<metadata>\r\n<idinfo>\r\n<citation>\r\n<citeinfo>\r\n<origin>Reger, R.D.</origin>\r\n<origin>Stevens, D.S.P.</origin>\r\n<origin>Solie, D.N.</origin>\r\n<pubdate>200812</pubdate>\r\n<title>Surficial-geologic map, Alaska Highway corridor, Delta Junction to Dot Lake, Alaska</title>\r\n<geoform>vector digital data</geoform>\r\n<serinfo>\r\n<sername>Preliminary Interpretive Report</sername>\r\n<issue>PIR 2008-3A</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>Fairbanks, Alaska - USA</pubplace>\r\n<publish>State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys</publish>\r\n</pubinfo>\r\n<othercit>35 p., 2 sheets, scale 1:63,360</othercit>\r\n<onlink>http://dx.doi.org/10.14509/17961</onlink>\r\n</citeinfo>\r\n</citation>\r\n<descript>\r\n<abstract>During 2006 and 2007 the Alaska Division of Geological & Geophysical Surveys conducted reconnaissance surficial-geologic mapping in segment 1 of the Alaska Highway corridor, which straddles the Alaska Highway through the Tanana River valley from Delta Junction to the eastern boundary of the Mt. Hayes Quadrangle. Surficial-geologic deposits were initially mapped by interpreting ~1:63,360-scale, false-color infrared aerial photographs taken in August 1980 and field verified in 2006-2007. </abstract>\r\n<purpose>This report and map are a part of ADGGS\'s Alaska Natural Gas Pipeline Geology and Geohazards project, mapping the surificial-geologic deposits along the the Alaska Highway between Delta Junction and Dot Lake. The study was done in anticipation of the proposed natural gas pipeline along the Alaska Highway corridor, to further the geologic understanding of the area andas a basis for evaluating geohazards for proposed infrastructure.</purpose>\r\n<supplinf>The layers listed below are present as ArcGIS shape files. To enhance print quality, this publication utilized a vector topography data set. The topography data set is not included with this release. Attribute information for the following layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. There are 6 layers. Each layer is listed and described in detail under its own heading starting "Entity_Type_Label."Layers include: \r\n>surf_geology\tpolygons of surficial-geologic map units\r\n>faults\ttrace of known active faults discussed in PIR 2008-3d\r\n>escarpment\ttrace of prominent escarpments discussed in text\r\n>soilpits\tlocations of soil pits discussed in the text\r\n>radiocarbon\tlocations of radiocarbon samples discussed in text \r\n>outline\toutline shape of the study area</supplinf>\r\n</descript>\r\n<timeperd>\r\n<timeinfo>\r\n<mdattim>\r\n<sngdate>\r\n<caldate>1969</caldate>\r\n</sngdate>\r\n<sngdate>\r\n<caldate>1970</caldate>\r\n</sngdate>\r\n<sngdate>\r\n<caldate>1980</caldate>\r\n</sngdate>\r\n<sngdate>\r\n<caldate>2006</caldate>\r\n</sngdate>\r\n<sngdate>\r\n<caldate>2007</caldate>\r\n</sngdate>\r\n</mdattim>\r\n</timeinfo>\r\n<current>ground condition</current>\r\n</timeperd>\r\n<status>\r\n<progress>Complete</progress>\r\n<update>Unknown</update>\r\n</status>\r\n<spdom>\r\n<bounding>\r\n<westbc>-145.947285</westbc>\r\n<eastbc>-143.936074</eastbc>\r\n<northbc>64.126215</northbc>\r\n<southbc>63.497248</southbc>\r\n</bounding>\r\n</spdom>\r\n<keywords>\r\n<theme>\r\n<themekt>None</themekt>\r\n<themekey>Age Dates</themekey>\r\n<themekey>Alluvial Deposits</themekey>\r\n<themekey>Alluvial Fan</themekey>\r\n<themekey>Alluvium</themekey>\r\n<themekey>C14</themekey>\r\n<themekey>Colluvial Deposits</themekey>\r\n<themekey>Colluvium</themekey>\r\n<themekey>Depositional Environment</themekey>\r\n<themekey>Dunes</themekey>\r\n<themekey>Eolian</themekey>\r\n<themekey>Erratics</themekey>\r\n<themekey>Esker</themekey>\r\n<themekey>Erosion</themekey>\r\n<themekey>Faults</themekey>\r\n<themekey>Floodplain</themekey>\r\n<themekey>Floods</themekey>\r\n<themekey>Gasline</themekey>\r\n<themekey>Geologic Hazards</themekey>\r\n<themekey>Geologic Map</themekey>\r\n<themekey>Geologic Materials</themekey>\r\n<themekey>Geomorphology</themekey>\r\n<themekey>Glacial Deposits</themekey>\r\n<themekey>Glacial Drift</themekey>\r\n<themekey>Glacial Geology</themekey>\r\n<themekey>Glacial Hazards</themekey>\r\n<themekey>Glacial Lake</themekey>\r\n<themekey>Glacial Processes</themekey>\r\n<themekey>Gravel</themekey>\r\n<themekey>Ice Contact Deposits</themekey>\r\n<themekey>Jokulhlaups</themekey>\r\n<themekey>Lake Level</themekey>\r\n<themekey>Landslide</themekey>\r\n<themekey>Measured Sections</themekey>\r\n<themekey>Outburst Floods</themekey>\r\n<themekey>Outwash</themekey>\r\n<themekey>Paleoenvironment</themekey>\r\n<themekey>Paleosols</themekey>\r\n<themekey>Paludal</themekey>\r\n<themekey>Peat</themekey>\r\n<themekey>Permafrost</themekey>\r\n<themekey>Proposed Natural Gas Pipeline</themekey>\r\n<themekey>Radiocarbon Dating</themekey>\r\n<themekey>Rock Glaciers</themekey>\r\n<themekey>Sand</themekey>\r\n<themekey>Soil</themekey>\r\n<themekey>Soils</themekey>\r\n<themekey>Surficial</themekey>\r\n<themekey>Surficial Geology</themekey>\r\n<themekey>Talus</themekey>\r\n<themekey>Terrace</themekey>\r\n<themekey>Thaw Lakes</themekey>\r\n<themekey>Transportation Corridor</themekey>\r\n<themekey>Unconsolidated Deposits</themekey>\r\n<themekey>Water Table</themekey>\r\n</theme>\r\n<place>\r\n<placekt>None</placekt>\r\n<placekey>Alaska Highway Corridor</placekey>\r\n<placekey>Big Delta</placekey>\r\n<placekey>Big Delta Quadrangle</placekey>\r\n<placekey>Delta Junction</placekey>\r\n<placekey>Delta River</placekey>\r\n<placekey>Lake George</placekey>\r\n<placekey>Mount Hayes Quadrangle</placekey>\r\n<placekey>Tanana River</placekey>\r\n<placekey>Dot Lake</placekey>\r\n</place>\r\n<temporal>\r\n<tempkt>None</tempkt>\r\n<tempkey>Holocene</tempkey>\r\n<tempkey>Quaternary</tempkey>\r\n<tempkey>Pleistocene</tempkey>\r\n<tempkey>Cenozoic</tempkey>\r\n<tempkey>Tertiary</tempkey>\r\n</temporal>\r\n</keywords>\r\n<accconst>This report, map, and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).</accconst>\r\n<useconst>Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.</useconst>\r\n<ptcontac>\r\n<cntinfo>\r\n<cntorgp>\r\n<cntorg>State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys</cntorg>\r\n</cntorgp>\r\n<cntpos>GIS Data Manager/Cartographer</cntpos>\r\n<cntaddr>\r\n<addrtype>mailing and physical</addrtype>\r\n<address>3354 College Road</address>\r\n<city>Fairbanks</city>\r\n<state>AK</state>\r\n<postal>99709-3707</postal>\r\n</cntaddr>\r\n<cntvoice>(907) 451-5029</cntvoice>\r\n<cntvoice>(907) 451-5020</cntvoice>\r\n<cntfax>(907) 451-5050</cntfax>\r\n<cntemail>dggspubs@alaska.gov</cntemail>\r\n<cntinst>You may view our web site at http://www.dggs.alaska.gov for the latest information on available data.Please e-mail your questions and data requests when possible since our web site and e-mail address will remain current even if our phone number and mailing address change.</cntinst>\r\n</cntinfo>\r\n</ptcontac>\r\n<datacred>This research was supported by Alaska State Capital Improvement Projects funding.Additional Acknowledgments: Mapping of surficial geology in the vicinity of the Clearwater Lake escarpment and its intersection with the trans-Alaska oil pipeline was accomplished in the mid 1970s in collaboration with Alyeska Pipeline Service Company, who released a report that includes data on near-surface stratigraphy and radiocarbon dates and provides evidence that the Clearwater Lake escarpment is not fault related (Alyeska Pipeline Service Company, 1976). We gratefully acknowledge the cooperation provided by Mike Metz and Alyeska. We also appreciate the logistical support and interest of Steve Squires and the rest of the Dry Creek community, who supplied us with fresh vegetables, excellent drinking water, and the log of their water well. Several other colleagues have collaborated in our study of this initial segment of the proposed pipeline corridor. Gary Carver brought his outstanding expertise in neotectonics of the central and eastern Alaska Range to the DGGS effort and provided enthusiastic leadership during the fault-trenching program. Tom Hamilton provided his unpublished report on the glacial history of the area and graciously allowed us to release his unpublished radiocarbon dates from the Gerstle River, Little Gerstle River, and Johnson River drainages. Tom Ager provided early black-and-white aerial photographs and discussed his interpretation of climatic changes in the corridor. Field visits with Dave Carter, John Galloway, and Florence Weber examined evidence of the oldest known glaciation in the corridor and first alerted us to the possibility of massive outburst flooding. Santosh Panda accompanied us into the field on numerous occasions and provided preliminary unpublished information on permafrost in the corridor. We thank the other members of the DGGS field crew, especially Kyle Obermiller and Sharon Hansen, for their support in the field and office, and Tom Ratledge for flying us safely in and out of all those tight places. Rod Combellick graciously reviewed this report and provided helpful comments that improved our presentation.</datacred>\r\n<native>ArcGIS 9.+, Adobe Acrobat Reader, and any text editor.</native>\r\n<crossref>\r\n<citeinfo>\r\n<origin>Reger, R.D.</origin>\r\n<origin>Solie, D.N.</origin>\r\n<pubdate>200812</pubdate>\r\n<title>Engineering-geology map, Alaska Highway Corriodr, Delta Junction to Dot Lake, Alaska</title>\r\n<geoform>vector digital data</geoform>\r\n<serinfo>\r\n<sername>Preliminary Interpretive Report</sername>\r\n<issue>PIR 2008-3B</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>Fairbanks AK</pubplace>\r\n<publish>Alaska Division of Geological & Geophysical Surveys</publish>\r\n</pubinfo>\r\n<othercit>2 sheets, scale 1:63,360</othercit>\r\n</citeinfo>\r\n</crossref>\r\n<crossref>\r\n<citeinfo>\r\n<origin>Reger, R.D.</origin>\r\n<origin>Solie, D.N.</origin>\r\n<pubdate>200809</pubdate>\r\n<title>Reconnaissance interpretation of permafrost, Alaska Highway corridor, Delta Junction to Dot Lake, Alaska</title>\r\n<geoform>vector digital data</geoform>\r\n<serinfo>\r\n<sername>Preliminary Interpretive Report</sername>\r\n<issue>PIR 2008-3C</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>Fairbanks AK</pubplace>\r\n<publish>Alaska Division of Geological & Geophysical Surveys</publish>\r\n</pubinfo>\r\n<othercit>10 p., 2 sheets, scale1:63,360</othercit>\r\n</citeinfo>\r\n</crossref>\r\n<crossref>\r\n<citeinfo>\r\n<origin>Carver, G.A.</origin>\r\n<origin>Bemis, S.P.</origin>\r\n<origin>Solie, D.N.</origin>\r\n<origin>Obermiller, K.E.</origin>\r\n<pubdate>200812</pubdate>\r\n<title>Active and potentially active faults in or near the Alaska Highway corridor, Delta Junction to Dot Lake, Alaska</title>\r\n<geoform>tabular digital data</geoform>\r\n<serinfo>\r\n<sername>preliminary interpretive report</sername>\r\n<issue>PIR 2008-D</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>Fairbanks AK</pubplace>\r\n<publish>Alaska Division of Geological & Geophysical Surveys</publish>\r\n</pubinfo>\r\n<othercit>32 p.</othercit>\r\n</citeinfo>\r\n</crossref>\r\n<crossref>\r\n<citeinfo>\r\n<origin>Solie, D.N.</origin>\r\n<origin>Werdon, M.B.</origin>\r\n<origin>Newberry, R.J.</origin>\r\n<origin>Freeman, L.K.</origin>\r\n<origin>Lessard, R.R.</origin>\r\n<pubdate>200802</pubdate>\r\n<title>Major-oxide, minor-oxide, trace-element and geochemical data from rocks collected in the Alaska Highway corridor, Mount Hayes quadrangle, Alaska in 2006 and 2007</title>\r\n<geoform>tabular digital data</geoform>\r\n<serinfo>\r\n<sername>Raw-data File</sername>\r\n<issue>RDF 2008-2</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>Fairbanks AK</pubplace>\r\n<publish>Alaska Division of Geological & Geophysical Surveys</publish>\r\n</pubinfo>\r\n<othercit>23 p.</othercit>\r\n</citeinfo>\r\n</crossref>\r\n</idinfo>\r\n<dataqual>\r\n<attracc>\r\n<attraccr>Initial reconnaissance field observations were made in 2006, after which surficial geology air-photo interpretations were done. Contacts were hand-drawn, using a magnifying stereoscope, onto acetate air-photo overlays at the scale of the air-photos (approximately inch-to-the-mile). The air-photos were taken in August 1980. During summer field work in 2007, map units were described, samples collected for analysis, and a limited number of test pits was dug. The accuracy of the map unit boundary locations vary due to the scale and interpretive nature of the mapping, but are expected to be accurate to at least 50 ft. Map units labeled with a "?" are considered to have an uncertain assignation. Information from previous geologic reports was incorporated during the interpretation process.</attraccr>\r\n</attracc>\r\n<logic>Polygon topology is present on appropriate coverages; others are line or point coverages.</logic>\r\n<complete>This dataset includes coverages that contain information about the mapped and interpreted surficial-geologic deposits in the map area. Subsurface data were not available for use in creating this map coverage, other than about 10-15 soil pits dug to depths no more than 1.3 m and observations of exposures in gravel pits, highway cuts, and river banks. Soil colors were described using the Munsell soil color charts. The Wentworth scale was used for grain size classification. Soil horizon descriptions in the map area used the U.S. Soil Conservation Service soil taxonomy (Soil Survey Staff, 1975). The radiocarbon analyses shown on Table 2, from T.D. Hamilton (unpublished), were run by Geochron Laboratories in the 1970\'s. Specific analytical procedures were not reported. The active faults shown on sheets 1 and 2 are more fully described in ADGGS Preliminary Interpretive Report 2008-3d by Carver and others (2008).</complete>\r\n<posacc>\r\n<horizpa>\r\n<horizpar>The surficial geology was first hand-drawn, using a magnifying stereoscope, onto acetate overlays registered to 1:50,000-scale (nominal) prints of digital aerial photographs. The horizontal accuracy of the map unit boundary locations varies due to the scale and interpretive nature of the mapping, but is expected to be accurate to at least 15 m.The 400dpi digital air photos were orthorectified using OrthoMapper 3.6 with an RMS error generally constrained to be less than 4 pixels, equating to approximately 20 m on the ground, although some areas with rugged terrain have larger errors.The individual orthophotos were mosaicked using Erdas Imagine 9.2 and ArcGIS 9. The acetate overlays were individually scanned and orthorectified using OrthoMapper based on the same equations developed for generating the orthophotos. Map unit boundaries were digitized on-screen into ArcGIS from the orthorectified overlays at a scale of approximately 1:25,000, using a combination of a digital USGS topographic 1:63,360-scale map layer (DRG) and the orthophoto mosaic layer to verify the position of the lines. Total horizontal accuracy of the mapped surficial-geologic contacts is thus on the order of 25 m or better, with somewhat lesser accuracy expected in areas of rugged relief.Coordinates of soil pits and other field sites that are discussed in the text were recorded using a Garmin GPS model 76CSx with a horizontal error of 4 meters or less. Radiocarbon sample localities on sheets 1 and 2 were located by visual transfer of points from hand-drawn figures (T.D. Hamilton, unpublished) and should be considered estimated locations with an accuracy of approximately 120 m or better.</horizpar>\r\n<qhorizpa>\r\n<horizpav>25</horizpav>\r\n<horizpae>mapped surficial-geologic contacts</horizpae>\r\n</qhorizpa>\r\n<qhorizpa>\r\n<horizpav>4</horizpav>\r\n<horizpae>soilpits and other field sites</horizpae>\r\n</qhorizpa>\r\n<qhorizpa>\r\n<horizpav>120</horizpav>\r\n<horizpae>radiocarbon sample localities</horizpae>\r\n</qhorizpa>\r\n</horizpa>\r\n</posacc>\r\n<lineage>\r\n<srcinfo>\r\n<srccite>\r\n<citeinfo>\r\n<origin>Kreig, R.A.</origin>\r\n<origin>Reger, R.D.</origin>\r\n<pubdate>1976</pubdate>\r\n<title>Preconstruction terrain evaluation for the trans-Alaska pipeline project</title>\r\n<geoform>book chapter</geoform>\r\n<pubinfo>\r\n<pubplace>Stroudsburg</pubplace>\r\n<publish>Dowden, Hutchinson, and Ross</publish>\r\n</pubinfo>\r\n<othercit>in Coates, D.R., ed., Geomorphology and engineering: p. 55\x9676.</othercit>\r\n</citeinfo>\r\n</srccite>\r\n<typesrc>paper</typesrc>\r\n<srctime>\r\n<timeinfo>\r\n<sngdate>\r\n<caldate>1976</caldate>\r\n</sngdate>\r\n</timeinfo>\r\n<srccurr>ground condition</srccurr>\r\n</srctime>\r\n<srccitea>Kreig and Reger, 1976</srccitea>\r\n<srccontr>Contains terrain evaluation for trans-Alaska oil pipeline</srccontr>\r\n</srcinfo>\r\n<srcinfo>\r\n<srccite>\r\n<citeinfo>\r\n<origin>Kreig, R.A.</origin>\r\n<origin>Reger, R.D.</origin>\r\n<pubdate>1982</pubdate>\r\n<title>Air-photo analysis and summary of landform soil properties along the route of the Trans-Alaska Pipeline System</title>\r\n<geoform>document</geoform>\r\n<serinfo>\r\n<sername>Geologic Report</sername>\r\n<issue>GR-66</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>Fairbanks AK</pubplace>\r\n<publish>Alaska Division of Geological & Geophysical Surveys</publish>\r\n</pubinfo>\r\n<othercit>149 p.</othercit>\r\n</citeinfo>\r\n</srccite>\r\n<typesrc>paper</typesrc>\r\n<srctime>\r\n<timeinfo>\r\n<sngdate>\r\n<caldate>1982</caldate>\r\n</sngdate>\r\n</timeinfo>\r\n<srccurr>ground condition</srccurr>\r\n</srctime>\r\n<srccitea>Kreig and Reger, 1982</srccitea>\r\n<srccontr>Contains air-photo analysis and landform soil properties for trans-Alaska oil pipeline</srccontr>\r\n</srcinfo>\r\n<srcinfo>\r\n<srccite>\r\n<citeinfo>\r\n<origin>P\xe9w\xe9, T.L.</origin>\r\n<origin>Reger, R.D.</origin>\r\n<pubdate>1983</pubdate>\r\n<title>Middle Tanana River valley</title>\r\n<geoform>book chapter</geoform>\r\n<serinfo>\r\n<sername>Guidebook</sername>\r\n<issue>Guidebook 1</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>Fairbanks AK</pubplace>\r\n<publish>Alaska Division of Geological & Geophysical Surveys</publish>\r\n</pubinfo>\r\n<othercit>in P\xe9w\xe9, T.L., and Reger, R.D., eds., Guidebook to permafrost and Quaternary geology along the Richardson and Glenn Highways between Fairbanks and Anchorage, Alaska, p. 5\x9645</othercit>\r\n<lworkcit>\r\n<citeinfo>\r\n<origin>P\xe9w\xe9, T.L., ed.</origin>\r\n<origin>Reger, R.D., ed.</origin>\r\n<pubdate>1983</pubdate>\r\n<title>Guidebook to permafrost and Quaternary geology along the Richardson and Glenn Highways between Fairbanks and Anchorage, Alaska</title>\r\n<geoform>document</geoform>\r\n<serinfo>\r\n<sername>Guidebook</sername>\r\n<issue>Guidebook 1</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>Fairbanks AK</pubplace>\r\n<publish>Alaska Division of Geological & Geophysical Surveys</publish>\r\n</pubinfo>\r\n</citeinfo>\r\n</lworkcit>\r\n</citeinfo>\r\n</srccite>\r\n<typesrc>paper</typesrc>\r\n<srctime>\r\n<timeinfo>\r\n<sngdate>\r\n<caldate>1983</caldate>\r\n</sngdate>\r\n</timeinfo>\r\n<srccurr>ground condition</srccurr>\r\n</srctime>\r\n<srccitea>Pewe and Reger, 1983</srccitea>\r\n<srccontr>Contains information about Quaternary geology of Tanana Valley</srccontr>\r\n</srcinfo>\r\n<srcinfo>\r\n<srccite>\r\n<citeinfo>\r\n<origin>Carter, L.D.</origin>\r\n<origin>Galloway, J.P.</origin>\r\n<pubdate>1978</pubdate>\r\n<title>Preliminary engineering geologic maps of the proposed natural gas pipeline route in the Tanana River valley, Alaska</title>\r\n<geoform>document</geoform>\r\n<serinfo>\r\n<sername>Open-file report</sername>\r\n<issue>OFR 78-794</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>United States</pubplace>\r\n<publish>U.S. Geological Survey</publish>\r\n</pubinfo>\r\n<othercit>26 p., 3 map sheets, scale 1:125,000</othercit>\r\n</citeinfo>\r\n</srccite>\r\n<typesrc>paper</typesrc>\r\n<srctime>\r\n<timeinfo>\r\n<sngdate>\r\n<caldate>1978</caldate>\r\n</sngdate>\r\n</timeinfo>\r\n<srccurr>ground condition</srccurr>\r\n</srctime>\r\n<srccitea>Carter and Galloway, 1978</srccitea>\r\n<srccontr>engineering geologic maps at 1:125,000</srccontr>\r\n</srcinfo>\r\n<srcinfo>\r\n<srccite>\r\n<citeinfo>\r\n<origin>Carver, G.A.</origin>\r\n<origin>Bemis, S.P.</origin>\r\n<origin>Solie, D.N.</origin>\r\n<origin>Obermiller, K.E.</origin>\r\n<pubdate>200812</pubdate>\r\n<title>Active and potentially active faults in or near the Alaska Highway corridor, Delta Junction to Dot Lake, Alaska</title>\r\n<geoform>tabular digital data</geoform>\r\n<serinfo>\r\n<sername>Preliminary Interpretive Report</sername>\r\n<issue>PIR 2008-3D</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>Fairbanks AK</pubplace>\r\n<publish>Alaska Division of Geological & Geophysical</publish>\r\n</pubinfo>\r\n<othercit>32 p.</othercit>\r\n</citeinfo>\r\n</srccite>\r\n<typesrc>online</typesrc>\r\n<srctime>\r\n<timeinfo>\r\n<sngdate>\r\n<caldate>2007</caldate>\r\n</sngdate>\r\n</timeinfo>\r\n<srccurr>ground condition</srccurr>\r\n</srctime>\r\n<srccitea>Carver and others, 2008</srccitea>\r\n<srccontr>Source of active faults shown on map sheets 1 and 2</srccontr>\r\n</srcinfo>\r\n<srcinfo>\r\n<srccite>\r\n<citeinfo>\r\n<origin>Duk-Rodkin, Alejandra</origin>\r\n<origin>Barendregt, R.W.</origin>\r\n<origin>Froese, D.G.</origin>\r\n<origin>Weber, Florence</origin>\r\n<origin>Enkin, Randy</origin>\r\n<origin>Smith, I.R.</origin>\r\n<origin>Waters, Pamela</origin>\r\n<origin>Klassen, Rudy</origin>\r\n<pubdate>2004</pubdate>\r\n<title>Timing and extent of Plio\x96Pleistocene glaciations in northwestern Canada</title>\r\n<geoform>book chapter</geoform>\r\n<serinfo>\r\n<sername>Development in Quaternary Science</sername>\r\n<issue>v.2</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>New York</pubplace>\r\n<publish>Elsevier</publish>\r\n</pubinfo>\r\n<othercit>p. 313\x96345</othercit>\r\n<lworkcit>\r\n<citeinfo>\r\n<origin>Ehlers, J.</origin>\r\n<origin>Gibbard, P.L.</origin>\r\n<pubdate>2004</pubdate>\r\n<title>Quaternary glaciations\x97extent and chronology, part II: North America</title>\r\n<geoform>book chapter</geoform>\r\n<serinfo>\r\n<sername>Development in Quaternary Science</sername>\r\n<issue>v. 2</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>New York</pubplace>\r\n<publish>Elsevier</publish>\r\n</pubinfo>\r\n<othercit>p. 313\x96345</othercit>\r\n</citeinfo>\r\n</lworkcit>\r\n</citeinfo>\r\n</srccite>\r\n<typesrc>paper</typesrc>\r\n<srctime>\r\n<timeinfo>\r\n<sngdate>\r\n<caldate>2004</caldate>\r\n</sngdate>\r\n</timeinfo>\r\n<srccurr>ground condition</srccurr>\r\n</srctime>\r\n<srccitea>Duk-Rodkin and others, 2004</srccitea>\r\n<srccontr>Information about timing of glaciation in Canada and Alaska</srccontr>\r\n</srcinfo>\r\n<srcinfo>\r\n<srccite>\r\n<citeinfo>\r\n<origin>Hamilton, T.D.</origin>\r\n<pubdate>1994</pubdate>\r\n<title>Late Cenozoic glaciation of Alaska</title>\r\n<geoform>book chapter</geoform>\r\n<serinfo>\r\n<sername>Geology of North America</sername>\r\n<issue>v. G-1</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>United States</pubplace>\r\n<publish>Geological Society of America</publish>\r\n</pubinfo>\r\n<othercit>p. 813\x96844</othercit>\r\n<lworkcit>\r\n<citeinfo>\r\n<origin>Plafker, George</origin>\r\n<origin>Berg, H.C.</origin>\r\n<pubdate>1994</pubdate>\r\n<title>The Geology of Alaska</title>\r\n<geoform>book chapter</geoform>\r\n<serinfo>\r\n<sername>Geology of North America</sername>\r\n<issue>v. G-1</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>United States</pubplace>\r\n<publish>Geological Society of America</publish>\r\n</pubinfo>\r\n<othercit>p. 813\x96844</othercit>\r\n</citeinfo>\r\n</lworkcit>\r\n</citeinfo>\r\n</srccite>\r\n<typesrc>paper</typesrc>\r\n<srctime>\r\n<timeinfo>\r\n<sngdate>\r\n<caldate>1994</caldate>\r\n</sngdate>\r\n</timeinfo>\r\n<srccurr>ground condition</srccurr>\r\n</srctime>\r\n<srccitea>Hamilton, 1994</srccitea>\r\n<srccontr>Late Cenozoic glaciation of Alaska</srccontr>\r\n</srcinfo>\r\n<srcinfo>\r\n<srccite>\r\n<citeinfo>\r\n<origin>Holmes, G.W.</origin>\r\n<pubdate>1965</pubdate>\r\n<title>Geologic reconnaissance along the Alaska Highway, Delta River to Tok Junction, Alaska</title>\r\n<geoform>document</geoform>\r\n<serinfo>\r\n<sername>Bulletin</sername>\r\n<issue>1181-H</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>United States</pubplace>\r\n<publish>U.S. Geological Survey</publish>\r\n</pubinfo>\r\n<othercit>19 p., 1 map sheet, scale 1:125,000.</othercit>\r\n</citeinfo>\r\n</srccite>\r\n<typesrc>paper</typesrc>\r\n<srctime>\r\n<timeinfo>\r\n<sngdate>\r\n<caldate>1965</caldate>\r\n</sngdate>\r\n</timeinfo>\r\n<srccurr>ground condition</srccurr>\r\n</srctime>\r\n<srccitea>Holmes, 1965</srccitea>\r\n<srccontr>Geologic reconnaissance along the Alaska Highway, Delta River to Tok Junction</srccontr>\r\n</srcinfo>\r\n<srcinfo>\r\n<srccite>\r\n<citeinfo>\r\n<origin>Mason, O.K.</origin>\r\n<origin>Beg\xe9t, J.E.</origin>\r\n<pubdate>1991</pubdate>\r\n<title>Late Holocene flood history of the Tanana River, Alaska</title>\r\n<geoform>journal article</geoform>\r\n<pubinfo>\r\n<pubplace>United States</pubplace>\r\n<publish>Arctic and Alpine Research</publish>\r\n</pubinfo>\r\n<othercit>v. 23, no. 4, p. 392\x96403.</othercit>\r\n</citeinfo>\r\n</srccite>\r\n<typesrc>paper</typesrc>\r\n<srctime>\r\n<timeinfo>\r\n<sngdate>\r\n<caldate>1991</caldate>\r\n</sngdate>\r\n</timeinfo>\r\n<srccurr>ground condition</srccurr>\r\n</srctime>\r\n<srccitea>Mason and Beget, 1991</srccitea>\r\n<srccontr>Holocene flooding in Tanana valley</srccontr>\r\n</srcinfo>\r\n<srcinfo>\r\n<srccite>\r\n<citeinfo>\r\n<origin>Muhs, D.R.</origin>\r\n<origin>Ager, T.A.</origin>\r\n<origin>Betis, E.A., III </origin>\r\n<origin>McGeehin, John</origin>\r\n<origin>Been, J.M.</origin>\r\n<origin>Beg\xe9t, J.E.</origin>\r\n<origin>Pavich, M.J.</origin>\r\n<origin>Stafford, T.W., Jr.</origin>\r\n<origin>Stevens, D.S.P</origin>\r\n<pubdate>2003</pubdate>\r\n<title>Stratigraphy and palaeoclimatic signifi cance of late Quaternary loess\x96palaeosol sequences of the late interglacial\x96glacial cycle in central Alaska</title>\r\n<geoform>journal article</geoform>\r\n<pubinfo>\r\n<pubplace>United States</pubplace>\r\n<publish>Quaternary Science Reviews</publish>\r\n</pubinfo>\r\n<othercit>v. 22, p.1,947\x961,986.</othercit>\r\n</citeinfo>\r\n</srccite>\r\n<typesrc>paper</typesrc>\r\n<srctime>\r\n<timeinfo>\r\n<sngdate>\r\n<caldate>2003</caldate>\r\n</sngdate>\r\n</timeinfo>\r\n<srccurr>ground condition</srccurr>\r\n</srctime>\r\n<srccitea>Muhs and others, 2003</srccitea>\r\n<srccontr>Loess sequences in central Alaska</srccontr>\r\n</srcinfo>\r\n<srcinfo>\r\n<srccite>\r\n<citeinfo>\r\n<origin>P\xe9w\xe9, T.L.</origin>\r\n<pubdate>1975</pubdate>\r\n<title>Quaternary geology of Alaska</title>\r\n<geoform>document</geoform>\r\n<serinfo>\r\n<sername>Professional Paper</sername>\r\n<issue>PP 835</issue>\r\n</serinfo>\r\n<pubinfo>\r\n<pubplace>United States</pubplace>\r\n<publish>U.S. Geological Survey</publish>\r\n</pubinfo>\r\n<othercit>145 p.</othercit>\r\n</citeinfo>\r\n</srccite>\r\n<typesrc>paper</typesrc>\r\n<srctime>\r\n<timeinfo>\r\n<sngdate>\r\n<caldate>1975</caldate>\r\n</sngdate>\r\n</timeinfo>\r\n<srccurr>ground condition</srccurr>\r\n</srctime>\r\n<srccitea>Pewe, 1975</srccitea>\r\n<srccontr>Quaternary geology of Alaska</srccontr>\r\n</srcinfo>\r\n<srcinfo>\r\n<srccite>\r\n<citeinfo>\r\n<origin>Weber, F.R.</origin>\r\n<pubdate>1986</pubdate>\r\n<title>Glacial geology of the Yukon\x96Tanana Upland</title>\r\n<geoform>book chapter</geoform>\r\n<pubinfo>\r\n<pubplace>Anchorage, Alaska</pubplace>\r\n<publish>Alaska Geological Society</publish>\r\n</pubinfo>\r\n<othercit>p. 79\x9698.</othercit>\r\n<lworkcit>\r\n<citeinfo>\r\n<origin>Hamilton, T.D., ed.</origin>\r\n<origin>Reed, K.M., ed.</origin>\r\n<origin>Thorson, R.M., ed.</origin>\r\n<pubdate>1986</pubdate>\r\n<title>Glaciation in Alaska; The geologic record</title>\r\n<geoform>book chapter</geoform>\r\n<pubinfo>\r\n<pubplace>Anchorage, Alaska</pubplace>\r\n<publish>Alaska Geological Society</publish>\r\n</pubinfo>\r\n<othercit>p. 79\x9698.</othercit>\r\n</citeinfo>\r\n</lworkcit>\r\n</citeinfo>\r\n</srccite>\r\n<typesrc>paper</typesrc>\r\n<srctime>\r\n<timeinfo>\r\n<sngdate>\r\n<caldate>1986</caldate>\r\n</sngdate>\r\n</timeinfo>\r\n<srccurr>ground condition</srccurr>\r\n</srctime>\r\n<srccitea>Weber, 1986</srccitea>\r\n<srccontr>Glacial geology of the Yukon\x96Tanana Upland</srccontr>\r\n</srcinfo>\r\n<procstep>\r\n<procdesc>Aerial photograph interpretation- Stereo pairs of ~1:63,360-scale, false-color infrared aerial photographs taken in August 1980 were used to initially map the surficial geology. Unit boundaries were drawn by hand onto acetate overlays, using a magnifying stereoscope. Overlays were registered to aerial photos using tick marks on the photos. Digital aerial photos and scanned overlays were individually orthorectified using Orthomapper 3.6.</procdesc>\r\n<srcused>Krieg and Reger, 1976</srcused>\r\n<srcused>Kreig and Reger, 1982</srcused>\r\n<srcused>Carter and Galloway, 1978</srcused>\r\n<srcused>Holmes, 1965</srcused>\r\n<procdate>2007</procdate>\r\n</procstep>\r\n<procstep>\r\n<procdesc>Digital cartography- The acetate overlays were then individually scanned and orthorectified, using Orthomapper, v. 3.6, and georeferenced. The air-photos were orthorectified, photomosaiced and georeferenced. Map unit boundaries were digitized on-screen into ArcGIS from the orthorectified overlays at a scale more detailed than 1:63,360, using a combination of a USGS topographic 1:63.360 map layer and the orthophotomosaic layer to verify the position of the lines.Surficial geology map polygons and lines were then edited and attributed using ArcMap 9.0.</procdesc>\r\n<procdate>2008</procdate>\r\n</procstep>\r\n<procstep>\r\n<procdesc>Fieldwork - Reconnaissance field work was done in September 2006, during which observations were recorded for use during aerial photograph interpretation. In July-August 2007, field work to verify aerial photograph interpretations was performed. In addition to observations from ground traverses, several soil pits were dug using shovels to maximum depth of 1.3 meters to observe soil profiles, and observations of exposures along river banks and highway cuts were recorded.</procdesc>\r\n<srcused>Pewe and Reger, 1983</srcused>\r\n<srcused>Carver and others, 2008</srcused>\r\n<srcused>Duk-Rodkin and others, 2004</srcused>\r\n<srcused>Hamilton, 1994</srcused>\r\n<srcused>Mason and Beget, 1991</srcused>\r\n<srcused>Muhs and others, 2003</srcused>\r\n<srcused>Pewe, 1975</srcused>\r\n<srcused>Weber, 1986</srcused>\r\n<procdate>2007</procdate>\r\n</procstep>\r\n<procstep>\r\n<procdesc>Metadata creation - Metadata were assembled by D.N. Solie to FGDC Standards using Metavist 1.2, DGGS 7.05, a data entry program for FGDC metadata with XML output.</procdesc>\r\n<procdate>2008</procdate>\r\n</procstep>\r\n<procstep>\r\n<procdesc>radiocarbon_data - radiocarbon samples were collected by Thomas D. Hamilton during fieldwork in 1969 and analyzed in the 1970\'s by Geochron Laboratories. Analytical details are not known.</procdesc>\r\n<procdate>1969</procdate>\r\n</procstep>\r\n</lineage>\r\n</dataqual>\r\n<spdoinfo>\r\n<direct>Vector</direct>\r\n</spdoinfo>\r\n<spref>\r\n<horizsys>\r\n<planar>\r\n<gridsys>\r\n<gridsysn>Universal Transverse Mercator</gridsysn>\r\n<utm>\r\n<utmzone>6</utmzone>\r\n<transmer>\r\n<sfctrmer>0.999600</sfctrmer>\r\n<longcm>-147.000000</longcm>\r\n<latprjo>0</latprjo>\r\n<feast>500000.0</feast>\r\n<fnorth>0</fnorth>\r\n</transmer>\r\n</utm>\r\n</gridsys>\r\n<planci>\r\n<plance>coordinate pair</plance>\r\n<coordrep>\r\n<absres>0.000000001</absres>\r\n<ordres>0.000000001</ordres>\r\n</coordrep>\r\n<plandu>meters</plandu>\r\n<pclname>surf_geology</pclname>\r\n</planci>\r\n</planar>\r\n<planar>\r\n<gridsys>\r\n<gridsysn>Universal Transverse Mercator</gridsysn>\r\n<utm>\r\n<utmzone>6</utmzone>\r\n<transmer>\r\n<sfctrmer>0.999600</sfctrmer>\r\n<longcm>-147.000000</longcm>\r\n<latprjo>0</latprjo>\r\n<feast>500000.0</feast>\r\n<fnorth>0</fnorth>\r\n</transmer>\r\n</utm>\r\n</gridsys>\r\n<planci>\r\n<plance>coordinate pair</plance>\r\n<coordrep>\r\n<absres>0.000000001</absres>\r\n<ordres>0.000000001</ordres>\r\n</coordrep>\r\n<plandu>meters</plandu>\r\n<pclname>faults</pclname>\r\n</planci>\r\n</planar>\r\n<planar>\r\n<gridsys>\r\n<gridsysn>Universal Transverse Mercator</gridsysn>\r\n<utm>\r\n<utmzone>6</utmzone>\r\n<transmer>\r\n<sfctrmer>0.999600</sfctrmer>\r\n<longcm>-147.000000</longcm>\r\n<latprjo>0</latprjo>\r\n<feast>500000.0</feast>\r\n<fnorth>0</fnorth>\r\n</transmer>\r\n</utm>\r\n</gridsys>\r\n<planci>\r\n<plance>coordinate pair</plance>\r\n<coordrep>\r\n<absres>0.000000001</absres>\r\n<ordres>0.000000001</ordres>\r\n</coordrep>\r\n<plandu>meters</plandu>\r\n<pclname>escarpment</pclname>\r\n</planci>\r\n</planar>\r\n<planar>\r\n<gridsys>\r\n<gridsysn>Universal Transverse Mercator</gridsysn>\r\n<utm>\r\n<utmzone>6</utmzone>\r\n<transmer>\r\n<sfctrmer>0.999600</sfctrmer>\r\n<longcm>-147.000000</longcm>\r\n<latprjo>0</latprjo>\r\n<feast>500000.0</feast>\r\n<fnorth>0</fnorth>\r\n</transmer>\r\n</utm>\r\n</gridsys>\r\n<planci>\r\n<plance>coordinate pair</plance>\r\n<coordrep>\r\n<absres>0.000000001</absres>\r\n<ordres>0.000000001</ordres>\r\n</coordrep>\r\n<plandu>meters</plandu>\r\n<pclname>soilpits</pclname>\r\n</planci>\r\n</planar>\r\n<planar>\r\n<gridsys>\r\n<gridsysn>Universal Transverse Mercator</gridsysn>\r\n<utm>\r\n<utmzone>6</utmzone>\r\n<transmer>\r\n<sfctrmer>0.999600</sfctrmer>\r\n<longcm>-147.000000</longcm>\r\n<latprjo>0</latprjo>\r\n<feast>500000.0</feast>\r\n<fnorth>0</fnorth>\r\n</transmer>\r\n</utm>\r\n</gridsys>\r\n<planci>\r\n<plance>coordinate pair</plance>\r\n<coordrep>\r\n<absres>0.000000001</absres>\r\n<ordres>0.000000001</ordres>\r\n</coordrep>\r\n<plandu>meters</plandu>\r\n<pclname>radiocarbon</pclname>\r\n</planci>\r\n</planar>\r\n<planar>\r\n<gridsys>\r\n<gridsysn>Universal Transverse Mercator</gridsysn>\r\n<utm>\r\n<utmzone>6</utmzone>\r\n<transmer>\r\n<sfctrmer>0.999600</sfctrmer>\r\n<longcm>-147.000000</longcm>\r\n<latprjo>0</latprjo>\r\n<feast>500000.0</feast>\r\n<fnorth>0</fnorth>\r\n</transmer>\r\n</utm>\r\n</gridsys>\r\n<planci>\r\n<plance>coordinate pair</plance>\r\n<coordrep>\r\n<absres>0.000000001</absres>\r\n<ordres>0.000000001</ordres>\r\n</coordrep>\r\n<plandu>meters</plandu>\r\n<pclname>outline</pclname>\r\n</planci>\r\n</planar>\r\n<geodetic>\r\n<horizdn>North American Datum of 1927</horizdn>\r\n<ellips>Clarke 1866</ellips>\r\n<semiaxis>6378206.4</semiaxis>\r\n<denflat>294.978698</denflat>\r\n</geodetic>\r\n</horizsys>\r\n</spref>\r\n<eainfo>\r\n<detailed>\r\n<enttyp>\r\n<ealname>outline</ealname>\r\n<enttypl>outline.shp</enttypl>\r\n<enttypd>polygon outlining boundary of map area</enttypd>\r\n<enttypds>Alaska Division of Geological & Geophysical Surveys</enttypds>\r\n</enttyp>\r\n<attr>\r\n<attrlabl>Shape</attrlabl>\r\n<attrdef>shape of polygon outlining map boundary</attrdef>\r\n<attrdefs>Alaska Division of Geological & Geophysical Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>shape of map area</udom>\r\n</attrdomv>\r\n</attr>\r\n</detailed>\r\n<detailed>\r\n<enttyp>\r\n<ealname>surf_geology</ealname>\r\n<enttypl>surf_geology.shp</enttypl>\r\n<enttypd>polygons representing surficial-geologic map units</enttypd>\r\n<enttypds>Alaska Division of Geological & Geophysical Surveys</enttypds>\r\n</enttyp>\r\n<attr>\r\n<attrlabl>unit_label</attrlabl>\r\n<attrdef>Map unit label shown on map and described in text and codeset.pdf</attrdef>\r\n<attrdefs>Alaska Division of Geological & Geophysical Surveys</attrdefs>\r\n<attrdomv>\r\n<codesetd>\r\n<codesetn>PIR2008-3A_codeset.pdf</codesetn>\r\n<codesets>Alaska Division of Geological & Geophysical Surveys http://www.dggs.alaska.gov/metadata/PIR2008-3A_codeset.pdf</codesets>\r\n</codesetd>\r\n</attrdomv>\r\n</attr>\r\n</detailed>\r\n<detailed>\r\n<enttyp>\r\n<ealname>faults</ealname>\r\n<enttypl>faults.shp</enttypl>\r\n<enttypd>Trace of identified active faults</enttypd>\r\n<enttypds>Alaska Division of Geological & Geophysical Surveys</enttypds>\r\n</enttyp>\r\n<attr>\r\n<attrlabl>fault_type</attrlabl>\r\n<attrdef>Type of fault</attrdef>\r\n<attrdefs>Alaska Division of Geological & Geophysical Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Type of fault as represented by line symbol on map</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>name</attrlabl>\r\n<attrdef>Name of fault</attrdef>\r\n<attrdefs>Alaska Division of Geological & Geophysical Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Name of fault shown on map: Dot "T" Johnson fault (Granite Mountain and Dot Lake segments), Canteen fault, Panoramic fault</udom>\r\n</attrdomv>\r\n</attr>\r\n</detailed>\r\n<detailed>\r\n<enttyp>\r\n<ealname>escarpment</ealname>\r\n<enttypl>escarpment.shp</enttypl>\r\n<enttypd>Trace of prominent escarpments discussed in text</enttypd>\r\n<enttypds>Alaska Division of Geological & Geophysical Surveys</enttypds>\r\n</enttyp>\r\n<attr>\r\n<attrlabl>name</attrlabl>\r\n<attrdef>Name of escarpment</attrdef>\r\n<attrdefs>Alaska Division of Geological & Geophysical Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Escarpment name: Clearwater Lake escarpment, Gerstle-Clearwater escarpment, Dot Lake Village escarpment</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>type</attrlabl>\r\n<attrdef>Type of escarpment as represented by line type on map</attrdef>\r\n<attrdefs>Alaska Division of Geological & Geophysical Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>observed location or approximately located escarpment</udom>\r\n</attrdomv>\r\n</attr>\r\n</detailed>\r\n<detailed>\r\n<enttyp>\r\n<ealname>soilpits</ealname>\r\n<enttypl>soilpits.shp</enttypl>\r\n<enttypd>location of soilpits discussed in text</enttypd>\r\n<enttypds>Alaska Division of Geological & Geophysical Surveys</enttypds>\r\n</enttyp>\r\n<attr>\r\n<attrlabl>Soil_Pit_S</attrlabl>\r\n<attrdef>Label of individual soilpits shown on map</attrdef>\r\n<attrdefs>Alaska Division of Geological & Geophysical Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>Soil pit label: SP-1, SP-2, SP-3, SP-4, SP-5</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Northing</attrlabl>\r\n<attrdef>Northing of soil pit location</attrdef>\r\n<attrdefs>Alaska Division of Geological & Geophysical Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>7057387.085</rdommin>\r\n<rdommax>7079152.105</rdommax>\r\n<attrunit>meters</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Easting</attrlabl>\r\n<attrdef>Easting of soil pit location</attrdef>\r\n<attrdefs>Alaska Division of Geological & Geophysical Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>581647.801</rdommin>\r\n<rdommax>626929.894</rdommax>\r\n<attrunit>meters</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n</detailed>\r\n<detailed>\r\n<enttyp>\r\n<ealname>radiocarbon</ealname>\r\n<enttypl>radiocarbon.shp</enttypl>\r\n<enttypd>Location of radiocarbon samples described in text</enttypd>\r\n<enttypds>Alaska Division of Geological & Geophysical Surveys</enttypds>\r\n</enttyp>\r\n<attr>\r\n<attrlabl>Radiocarbo</attrlabl>\r\n<attrdef>Radiocarbon sample number</attrdef>\r\n<attrdefs>Alaska Division of Geological & Geophysical Surveys</attrdefs>\r\n<attrdomv>\r\n<udom>RC-1, RC-2, RC-3</udom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Northing</attrlabl>\r\n<attrdef>Northing of radiocarbon sample location</attrdef>\r\n<attrdefs>Alaska Division of Geological & Geophysical Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>7066480.506</rdommin>\r\n<rdommax>7072241.128</rdommax>\r\n<attrunit>meters</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n<attr>\r\n<attrlabl>Easting</attrlabl>\r\n<attrdef>Easting of radiocarbon sample location</attrdef>\r\n<attrdefs>Alaska Division of Geological & Geophysical Surveys</attrdefs>\r\n<attrdomv>\r\n<rdom>\r\n<rdommin>605243.687</rdommin>\r\n<rdommax>645960.985</rdommax>\r\n<attrunit>meters</attrunit>\r\n</rdom>\r\n</attrdomv>\r\n</attr>\r\n</detailed>\r\n</eainfo>\r\n<distinfo>\r\n<distrib>\r\n<cntinfo>\r\n<cntorgp>\r\n<cntorg>State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys</cntorg>\r\n</cntorgp>\r\n<cntpos>Natural Resource Technician</cntpos>\r\n<cntaddr>\r\n<addrtype>mailing and physical</addrtype>\r\n<address>3354 College Road</address>\r\n<city>Fairbanks</city>\r\n<state>AK</state>\r\n<postal>99709-3707</postal>\r\n<country>USA</country>\r\n</cntaddr>\r\n<cntvoice>907-451-5020</cntvoice>\r\n<cnttdd>None available.</cnttdd>\r\n<cntfax>907-451-5050</cntfax>\r\n<cntemail>dggspubs@alaska.gov</cntemail>\r\n<hours>8 am to 4:30 pm, Monday through Friday, except State holidays</hours>\r\n<cntinst>Please view our Web site (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.</cntinst>\r\n</cntinfo>\r\n</distrib>\r\n<resdesc>Preliminary Interpretive Report PIR 2008-3a</resdesc>\r\n<distliab>The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user\'s purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska\'s liability to the requester or anyone else exceed the fee paid for the electronic service or product.</distliab>\r\n<stdorder>\r\n<nondig>Current publication is available on paper. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard.</nondig>\r\n<fees>Printed publication can be purchased for $31, (contact information below) plus shipping if mailed.</fees>\r\n</stdorder>\r\n<stdorder>\r\n<digform>\r\n<digtinfo>\r\n<formname>PDF</formname>\r\n<formvern>1.6</formvern>\r\n<filedec>No compression applied</filedec>\r\n</digtinfo>\r\n<digtopt>\r\n<onlinopt>\r\n<computer>\r\n<networka>\r\n<networkr>http://www.dggs.alaska.gov/pubs</networkr>\r\n</networka>\r\n</computer>\r\n</onlinopt>\r\n</digtopt>\r\n</digform>\r\n<digform>\r\n<digtinfo>\r\n<formname>ArcGIS Shapefile</formname>\r\n<formvern>ESRI ArcGIS 9.x</formvern>\r\n<filedec>No compression applied</filedec>\r\n</digtinfo>\r\n<digtopt>\r\n<offoptn>\r\n<offmedia>CD-ROM</offmedia>\r\n<recfmt>Joliet</recfmt>\r\n</offoptn>\r\n</digtopt>\r\n</digform>\r\n<fees>Digital files on CD-ROM are available for $10.00 (contact information below). Scanned images of these products may be viewed online or downloaded for free from the DGGS Web site.</fees>\r\n<ordering>Order by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard.</ordering>\r\n<turnarnd>Two weeks unless special arrangements are made and an express fee is paid.</turnarnd>\r\n</stdorder>\r\n<techpreq>It is suggested that MapInfo users import ESRI shape files (if provided) due to the possibility of data loss when importing Arc Export .e00 files.Please check the MapInfo Web site (http://www.mapinfo.com/) for the latest documentation on importing Arc Export and/or ESRI shape files.</techpreq>\r\n</distinfo>\r\n<metainfo>\r\n<metd>20081205</metd>\r\n<metc>\r\n<cntinfo>\r\n<cntorgp>\r\n<cntorg>State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys</cntorg>\r\n</cntorgp>\r\n<cntpos>Metadata Manager</cntpos>\r\n<cntaddr>\r\n<addrtype>mailing and physical address</addrtype>\r\n<address>3354 College Road</address>\r\n<city>Fairbanks</city>\r\n<state>AK</state>\r\n<postal>99709-3707</postal>\r\n<country>USA</country>\r\n</cntaddr>\r\n<cntvoice>907-451-5039</cntvoice>\r\n<cntfax>907-451-5050</cntfax>\r\n<cntemail>dggspubs@alaska.gov</cntemail>\r\n<hours>8 am to 4:30 pm, Monday through Friday, except State holidays.</hours>\r\n<cntinst>Please contact us through the e-mail address above whenever possible.</cntinst>\r\n</cntinfo>\r\n</metc>\r\n<metstdn>FGDC Content Standard for Digital Geospatial Metadata</metstdn>\r\n<metstdv>FGDC-STD-001-1998</metstdv>\r\n<metac>none</metac>\r\n<metuc>If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.</metuc>\r\n</metainfo>\r\n</metadata>', 16436, 16437, 'invalid start byte')
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Date Created: 2026-01-17 20:08:10.363670
ed73c399-bc2f-4b0a-a5c9-16b07af2fa49
Identifier: https://dggs.alaska.gov/webpubs/metadata/RDF2024-16.xml
Title: N/A
Harvest Record ID: d2bf9937-0c4f-43de-8552-fa95b434474d
Error Message: record failed to transform: structure messages: validation messages: ERROR: ISO 19115-2 file did not contain a gmi:MI_Metadata | gmd:MD_Metadata tag
Type: TransformationException
Date Created: 2026-01-17 20:13:26.635688
bc0f6b62-92c5-44f4-8d25-7bc8acaf882a
Identifier: https://dggs.alaska.gov/webpubs/metadata/RDF2011-3D_hh.xml
Title: N/A
Harvest Record ID: 3c6fbd1b-6a44-45ef-a74e-5f41e6c9122c
Error Message: record failed to transform: structure messages: validation messages: ERROR: ISO 19115-2 file did not contain a gmi:MI_Metadata | gmd:MD_Metadata tag
Type: TransformationException
Date Created: 2026-01-17 20:09:09.253675
c48e4a35-f637-418c-88c4-3d90d31c4157
Identifier: https://dggs.alaska.gov/webpubs/metadata/RDF2024-19.xml
Title: N/A
Harvest Record ID: ee152b15-cfda-4f22-ad1e-fdda7659e724
Error Message: record failed to transform: structure messages: validation messages: ERROR: ISO 19115-2 file did not contain a gmi:MI_Metadata | gmd:MD_Metadata tag
Type: TransformationException
Date Created: 2026-01-17 20:13:28.039924
